Sql case in where clause. T-SQL Case Condition in Where Clause.


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    1. Sql case in where clause START_PLACE_ID to where clause case 2: when rm. SQL Case Statement in Where Clause. There are a number of examples using the CASE WHEN construct in SQL, such as the SELECT columns or in ORDER Learn how to use the SQL Server CASE expression to add if-else logic to SQL queries. UserName_First AS "First_Name", USERS. The database processes the expression from top-to-bottom. AND (c. In almost all databases, it comes down to "the optimizer understands boolean expressions". I didn't say you can't use case in where clause. You just need to use boolean logic (or rather the ternary logic that SQL uses) and rewrite it: WHERE DateDropped = 0 AND ( @JobsOnHold = 1 AND DateAppr I have the following simplified stored procedure where based on on the input parameter, I need to then do a case in the where clause. The expression null = null evaluates to unknown. table_a as a INNER JOIN How can I create a conditional WHERE clause in SQL Server that returns multiple values? Hot Network Questions YubiKey 5C NFC not recognized on Silicon MacBook with macOS Sonoma (14. No, Oracle can't use boolean expressions as results from functions. Those inputs are optional (or have default parameters as they prefer to call it). DW = 2 Then (date_created BETWEEN DATE Try this. In our case, this is order_category. AreaSubscription WHERE AreaSubscription. It can be used in the Insert statement as well. DECLARE @AreaId INT = 2 DECLARE @Areas Table(AreaId int) INSERT INTO @Areas SELECT AreaId FROM AreaMaster WHERE CityZoneId IN (SELECT CityZoneId FROM AreaMaster WHERE AreaId = @AreaID) IF EXISTS (SELECT BusinessId FROM dbo. I know CASE, and best I thought of is that if I pass 0 to parameter in stored procedure, it ignores that parameter, like this. SOME_TYPE LIKE 'NOTHING%' ELSE T1. Follow edited Aug 6, 2013 at 4:52. 1. – I would use a dynamic generated code in such a circumstance: declare @SalesUserId int,@SiteId int,@StartDate datetime, @EndDate datetime,@BrandID int declare @sql nvarchar(max) set @sql = N' SELECT * from Sales WHERE SaleDate BETWEEN @StartDate AND @EndDate AND SalesUserID IN ( Select SalesUserID FROM Sales WHERE SaleDate BETWEEN @StartDate The SQL Server analyzes the WHERE clause earlier. select c. Use CASE in a HAVING clause. and I don't want it. Example: WHERE id IS NOT NULL AND Code IS NOT NULL AND ((@ItemFor='' AND @ItemTo='') OR (id BETWEEN @ItemFor AND @ItemTo)) AND ((@CodeFor='' AND @CodeTo='') OR (Code BETWEEN @CodeFor AND @CodeTo)) use case in where clause sql server. For example (using SQL Server 2K5+ CTEs): WITH C1 AS ( SELECT a1 AS value1, b1 AS value2 FROM table WHERE condition1 ), C2 AS ( SELECT a2 AS value1, b2 AS value2 FROM table WHERE How to use case to do if-then logic in SQL. BusinessId = CompanyMaster. Case will not conditionally chose the evaluated code. Implement SQL use CASE statement in WHERE IN clause – Thom A. Furthermore, we can also use the combination of WHERE and IN clauses to retrieve the id and name column from the Department table where the code is either CS or EC: SELECT id, name FROM department WHERE code IN ('CS', 'EC'); In this query, This query: SELECT sc. For other parts of the query you just have to repeat the whole CASE expression and trust the optimiser to recognise it is the same. Evaluates a list of conditions and returns one of multiple possible result expressions. You may be able to turn this into a subquery and then JOIN it to whatever other relations you're working with. val + 1 You might need to do like this. SQL Case Statement - how to do it. 14 SQL CASE in WHERE Clause using parameters. Using UNIQUE in the WHERE clause. Second problem is that you are trying output a boolean value from your CASE. This is my code so far: create view dbo. Employee table. state_cd in (:stateCode)) then 1 else 0) end = 1; Oracle SQL Case Statement in Where Clause. The core issue is that 1) (1,2,. – Here is the exact logic to apply case when in where clause to match different columns with different parameters. Can You Use An SQL CASE Statement In WHERE Clause? Yes, you can use an SQL CASE in a WHERE clause. employeeid AND employeerole. You can also go the other way and push both conditionals into the where part of the case statement. SELECT * FROM [Table] WHERE CASE @Parameter WHEN value1 THEN Column1 WHEN value2 THEN Coumn2 END = CASE @Parameter WHEN value1 THEN @ParameterValue1 WHEN value2 THEN @ParameterValue2 END CASE is largely provided to allow for Boolean logic where Boolean logic is not normally permitted. it seems like Active is the Actual Column as well in your table. SQL Server : WHERE clause case with between. COMPARE_TYPE WHEN 'A' THEN T1. If the problem is more complex (i. For example, if a student scored 75% correct on an exam the database runs these operations: Here, we use COUNT as the aggregate function. Country = (CASE WHEN @Country > 0 THEN @Country ELSE (something else) END) If we include the Where clause with the SQL Where Case in it, then we get 290 rows returned: This still might not look like something useful right off the bat, but you’ll most likely come across a situation where you must make a decision in the SQL Where Case. Oracle: Using Case Statement in Where Clause. In this example, I will only two columns and will demonstrate to you how you can write a dynamic SQL like query based on if the condition has value or not. +1 (I reverse the order of those two conditions, so that c. SQL - Using CASE and OR in SELECT WHEN. This is not widely implemented so it may not work on certain database flavors I am trying to write a WHERE clause to look back 3 days when the day of the week is Monday by joining in the calendar table. Adding CASE WHEN to WHERE clause. How to do a case sensitive search in WHERE clause (I'm using SQL Server)? 272. ITEMGROUPID not like 'SMS%') or (ss. case in where clause - Toad SQL. The problem is it doesn't like by 'between' statement. Kindly guide me how can i return multiple parameters from case clause. It tests one expression against multiple values Without using a dynamic SQL. year + wines. Description, Employee. if there are null value, sql will retrieved data back to u, cheer =) SELECT USERS. employeeid = employeerole. When they leave some box empty, I want query to ignore clause. Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. Related. Though technically expressions, you’ll see many people refer to it as a statement. type from customer c where 1 = case coalesce( @type, '' ) when 'T' then case when c. Oracle SQL Case Statement in Where Clause. Assuming type is a stored procedure variable or parameter rather than a column in the customer table, I would put it like this:. END val ) c WHERE t. Nested CASE statement in the WHERE clause. This is how it works. For example: select case null when null then 1 else 2 end --> 2 You could make it work like case when x is null. The semantic difference may seem minor, but the behavioral difference is significant. SQL where clause CASE switch with multiple THEN. The statement returns the hourly rate for each job title in the HumanResources. Below is my SQL Statement with CASE Statement in WHERE clause. I'm doing some search, where users are choosing in dropdown some clauses. We can however use aliases in the ORDER BY clause, as demonstrated by using the StaffCount alias to sort the data on. CASE statement inside a WHERE clause in SQL Server. using case for multiple parameters in where condition using sql. UserName AS "Last_Name", USERS. val AND 2 * c. Basically I want to make a case in the where clause to include another filter condition based of the null/not null state of the @reportedByUserId. ; Second, the CASE expression returns either 1 or 0 based on the order status. SQL Switch/Case in 'where' clause. You can rewrite with nested CASE expressions:. Follow edited Jan 16, 2019 at 16:14. By using collation or casting to binary, like this: SELECT * FROM Users WHERE Username = @Username COLLATE SQL_Latin1_General_CP1_CS_AS AND Password = @Password COLLATE SQL_Latin1_General_CP1_CS_AS AND Username = @Username AND Password = @Password A CASE expression returns 1 scalar value and not 2 or an interval of values. Condition1 is to watch if the value from a column in tb1 is between two values in a two columns of tb2 but case inside where clause which contains where conditions in db2. SQL case when expression between? 1. The default values will be 'ALL'. val_1, t. FinancialYear, etc. select * from table where (case when column1>=column2 then column2>3 else column1>3 end) Expected output SELECT id, firstName, lastName FROM Person WHERE @Value = CASE WHEN @Filter = 'firstName' THEN firstName WHEN @Filter = 'lastName' THEN lastName END If this is your intent, then only one CASE expression is needed, regardless of the number of possible filter fields. While simple CASE statements compare an expression to fixed values, searched CASE statements evaluate one or more Boolean conditions. I am doing it to only scan the partition 'U' in case the variable ${mp_id} is in (1,2,3) or only scan partition 'E' of the table, if the variable ${mp_id} is in (4,5,6) etc. It’s good for displaying a value in We could have spent countless hours to optimize their performance for dynamic SQL, but the better option would have been us the CASE expression in the WHERE clause. WHERE CASE WHEN calendar. In It is less common, however you could still use CASE WHEN, like this: WHERE pw='correct' AND CASE WHEN id<800 THEN success=1 ELSE TRUE END AND YEAR(timestamp)=2011 this means: return success=1 (which can be TRUE or FALSE) You can write the where clause as: where (case when (:stateCode = '') then (1) when (:stateCode != '') and (vw. ID Column1 Column2 1 2 3 2 4 1 3 5 4 4 4 7 Query. if the first number only is specified then column X must equal that number. You can alter the default by setting a case-sensitive database collation, but that's fairly unusual. But they aren't quite dealing with my case. CASE in WHERE statement. In my query I have the following condition left Join Table2 on Table2. id = COALESCE(user_id, u. IsFrozen FROM employee, employeerole, roledef WHERE employee. tables t where case when t. 1) The only part of the SQL Statement where it is valid to use an alias declared in the SELECT list is the ORDER BY clause. SQL Server : how to use a variable with multiple variables in a case statement in a where clause. using Case stmt you can make the search efficient as it will use appropriate indexes you may have on this table. Case when in where clause Postgresql. So how can you determine the maximum value over a whole bunch The CASE in T-SQL is an expression that can return one of several atomic values - it cannot however return or handle code blocks, nor can it return half a WHERE clause. CASE statement in WHERE clause using OR operator. – Tony Andrews. ITEMGROUPID like 'SS%') CREATE TABLE case_in_where ( id integer PRIMARY KEY, name text NOT NULL ); INSERT INTO case_in_where (id, name) VALUES (1, 'foo'), (2, 'bar'), (3, 'baz'); CASE statements in where clauses are less efficient than boolean cases since if the first check fails, SQL will stop processing the line and continue on. The following shows the syntax of the As you can see i am unsure as to how to handle the case statement inside of the where clause. In the first case (no where clause) the SQL Server waits until interpreting the SELECT clause The top 2 answers (from Adam Robinson and Andrejs Cainikovs) are kinda, sorta correct, in that they do technically work, but their explanations are wrong and so could be misleading in many cases. In this article, CASE on WHERE CLAUSE SQL. Yes. Teradata SQL - Conditions depending on @Rich - The clause given will return all customers when the parameter is zero. id) AND su. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. The problem with your query is that in CASE expressions, the THEN and ELSE parts have to have an expression that evaluates to a number or a varchar or any other datatype but not to a boolean value. Hot Network Questions Is it legal to send a modified version of a GPL 3. select * from cardimport where STATUS = CASE WHEN STATUS = '' THEN 'F' ELSE STATUS END SQL> VAR a NUMBER; SQL> EXEC :a := NULL PL/SQL procedure successfully completed. sql with case in where clause. END_PLACE_ID > 0 then i need to append AND rm. How to use CASE in WHERE clause. select * from student where (cast (nvl(linerevnum,'0') as int)) = 1 liner We could have spent countless hours to optimize their performance for dynamic SQL, but the better option would have been us the CASE expression in the WHERE clause. If none are true (the percentage is less than 50 or null), it returns the value in the else clause which is F. Most cases it will be 2 or 3 (name city zip orderid things like this) Any help would be greatly appreciated. sql - problems with conditional WHERE clause with CASE For those looking to use a CASE in the WHERE clause, in the above adding an else true condition in the case block should allow the query to work as expected. Where clause in sql server with multiple values in case when. SELECT ROW_NUMBER() OVER(ORDER BY parentLocID) AS ROWNO, * INTO #ParentLocIds FROM (SELECT DISTINCT parentLocID FROM Locations WHERE locId IN (SELECT Distinct parentLocID from Locations where locId in (SELECT LocId FROM I am trying to do a case statement within the where clause in snowflake but I’m not quite sure how should I go about doing it. Id = Table1. Case statement and OR in SQL. EmployeeId, Employee. SQL Server: CASE statement in WHERE clause with IN condition. My query has a CASE statement within the WHERE clause that takes a How to implement this using case in where clause. Hot Network Questions I am trying to get the name of the Door Supervisor or Licensee depending on the Address. Improve this question. Age = 20 and P. val_3 FROM schema_name. val_3 BETWEEN 2 * c. 6. In this comprehensive 3,150 word guide, you’ll learn CASE statement fundamentals then advance to real-world analytic examples and performance optimization It looks like you are refactoring a stored procedure. I would like to use this result in WHERE clause, but Postgres says column 'd' does not exists. The simple SQL CASE statement is used for equality tests. So then clause can use: scalar_expression ::= arithmetic_expression | string_primary | enum_primary | datetime_primary | boolean_primary | case_expression | entity_type_expression. The examples below will show how this is done. now i need to have two more conditions in the where clause. But the where clause change depends on my equation. Either way, the CASE statement is going to be very efficient. This code is part of a WHERE clause, meaning everything here must resolve to a boolean "yes" or "no" result. SWITCH with LIKE inside SELECT query in MySQL. Am getting exception like this please help to find the wrong thing. CASE is provided in SQL to allow Boolean evaluation where it is not normally allowed. NOTE: I want to run this query in DB2 and SQL server , but really Data Base vendor is not important for me ,using sql dynamic query and (OR) in where clause has a performance hit . I use complex CASE WHEN for selecting values. I'm writing an SQL Query, where a few of the columns returned need to be calculated depending on quite a lot of conditions. See syntax, example and performance implications of this technique. I believe you can use a case statement in a where clause, here is how I do it: Select ProductID OrderNo, OrderType, OrderLineNo From Order_Detail Where ProductID in ( Select Learn how to use the SQL CASE expression to check conditions and return values in a query. If the first part of the clause @CustomerID = 0 evaluates to true the second part is ignored and all rows are matched (note the condition tests the variable not the table field). Can I use in WHERE clause? sql; oracle; plsql; oracle11g; Share. status in ('Close', 'Open') And the above condition gives me 2 extra rows because of the left join I am trying to avoid dynamic sql but if that is the only way so be it. using a CASE within WHERE. cityid in ('20', '5') then 1 else 0 end else case when c. AID that is supplied. – In Microsoft SQL Server, you can indeed use a CASE in a WHERE clause. The following example uses the CASE expression in a HAVING clause to restrict the rows returned by the SELECT statement. So I'm saying 'WHERE @year = [the result of this case statement]", which, depending on the value of @timePeriod, can be the value of d. What I say, is that you can't have a condition inside case statement. I really like to know how it's possible to achieve such a I'm a bit confused as to what you are trying to achieve (probably due to my non english background) but I'll try to answer all the possible cases. However, the SQL language does not have real boolean values; it only has comparison operators. I thought I'd do a little experimentation. – It is not an assignment but a relational operator. group by in case of nested cases The like operator is not case sensitive in almost all the SQL compilers. schema_id = 1 then 1 else 0 end = 1" – On SQL server 2005 I am trying to query this select statement SELECT AlarmEventTransactionTableTable. Case statement in where. See syntax, examples and a demo database with the Northwind sample data. 58. CASE and IN usage in Sql WHERE clause. Learn how to use CASE expression to evaluate a list of conditions and return one of multiple possible results in SQL Server. In addition: Don't use commas in the from clause. One of the multiple ways of writing this would be: I have to write one Stored Procedure, In which I have to find the value from the table on the basis of Last Name, Last name search criteria can be Exact, Begin with or Phonetic. FamilyName in (select Name from AnotherTable) Don't use conditional logic. Thanks for accepting this as the answer but Tony Andrews solution is a lot more straightforward and, in my view, the better answer. ColumnName != null which always evaluates to NULL. If you are on SQL2005+ you can use a CTE to avoid this issue which sometimes helps with Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company UPDATE. For example, while the SQL_Latin1_General_CP1_CI_AS collation will work in many cases, it should not be assumed to be the appropriate case-insensitive collation. maturity)) AND (%d < (wines. There are two forms for the CASE clause: simple and searched. That saves you processing time. When @UserRole = 'Analyst', the comparison SupervisorApprovedBy = NULL will give UNKNOWN (and the row won't pass the WHERE test). Retired AS "Retired" FROM Employee USERS WHERE (@Retired IS I need to write a case statement in the WHERE clause, which is - when current_date is 1st of Month then select data BETWEEN 1st day of prev month AND last day prev month ELSE FROM 1st of Curr month till date. SQL Server : CASE WHEN in the WHERE Clause with IN. Actually I have this in a long WHERE clause (this is just the part concerned by the question): AND (%d >= (wines. ITEMGROUPID like 'S%' and ss. But i didn't find similar to my scenario. Is that possible? Thanks a lot, Radu. Show all customer ids and number of orders for those I'm wondering which is the better performance or best practice when dealing with multiple criteria in the WHERE clause and NULL values. case 1: when rm. SSN LIKE SSN does not work when SSN is NULL because SSN IS NULL needs to be there). ID= sc. ; Third, the SUM() function adds up the number of order for each order status. 5 "CASE WHEN" operator in "IN" statement. +1 For the second query though which will potentially be more efficient as it allows an index range seek rather than an entire scan. Borrowing your example var l varchar2(4); exec :l := '551F'; with rws as ( select '551C' assembly_line from dual union all select That CASE WHEN in the WHERE is wrong. Modified 5 years, 4 months ago. Isactive = 1) END AND isSubmitted = 1 END for simplicity sake, you can try below sample conditional logic: DECLARE @enddate datetime2(7); SET @enddate = NULL; SELECT @enddate; IF @enddate IS NULL SELECT 1, 2 FROM dbo. – Tim Biegeleisen. Oracle SQL CASE expression in WHERE clause only when conditions are met. Also, always put the more costly statement on the other side of your boolean check. Both forms return a result based on testing an expression. Learn all about the SQL CASE statement (plus examples) in this guide. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. How to convert string field and use for Where clause. 2 of said parameters are numbers. I'd investigate using an INNER JOIN instead: You actually don't need the case here, this or clause will try the friendly name first it it was null it won't match, then it will try to match using the real name. Hot Never forget that in Oracle SQL the '' literal (empty string) is the same as NULL, hence your predicate e. SQL Case insensitive IN search. cityid in ('20' ) then 1 It is not allowed to use aliases in where clause (in sql server), because the order of logical execution of the query is as follows: FROM; ON; JOIN; WHERE; GROUP BY; WITH CUBE or WITH ROLLUP; HAVING; SELECT; DISTINCT; T-SQL where clause case statement. I have given different Table Name but you can do like this logic: Declare @condition as int = 1 SELECT * FROM mstCity WHERE( (1=@condition and Name IN (SELECT AliasCity. I found one question answered with the ROW_NUMBER() function in the where clause. Always use proper, explicit join syntax. 8. There is a major, major difference between using a CASE expression and boolean expressions in the WHERE clause. DeviceID WHEN DeviceID IN( '7 Since we cannot re-use aliases in T-SQL, we need to use the same expression inside the COUNT aggregate and in the GROUP BY clause. It will not execute as it says: Incorrect syntax near '=' PROCEDURE [dbo]. For example, if aid 1 is supplied in the WHERE clause, then Ian is returned from the door supervisor table, however if aid 2 is supplied in the WHERE clause then Maria is returned from the Licensee table. Here is one way to include a case statement in a Where clause: SELECT * FROM sometable WHERE 1 = CASE WHEN somecondition THEN 1 WHEN someothercondition THEN 2 ELSE END Share. I don't want to write a Dynamic SQL. 0. Hot Network Questions Dative in front of accusative In this example: First, the condition in the WHERE clause includes sales order in 2018. CASE statements create values. val_2, t. ) is not an expression and thus cannot be the result of CASE; and, supporting 2) IN requires a fixed tuple (not an expression of one which is not possible) - therefor, it will never work like that. Share. when_clause::= WHEN conditional_expression THEN scalar_expression. (Actually, we use NULL as the "no argument" value, I'm trying to interpret what you are saying correctly. 3. The next one is more close. LastName = @LastName OR @LastName IS NULL). Case insensitive searching in Oracle. Here is my Query: SELECT and, if taken literally, implies that the subquery should even be in a WHERE clause, let alone in a CASE statement. Is there a way to filter CASE WHEN condition with where clause in SSMS 2012? sql; sql-server; t-sql; ssms; ssms-2012; Share. START_PLACE_ID > 0 then i need to append AND rm. Good day Stackoverflow! I have a query that is giving me an error: "Missing Right Parenthesis", at least, so says SQL Developer. WHERE clause on CASE Statement alias. CASE statement in WHERE clause with IN condition. How to use SQL IN operator with CASE in select query where clause. Some databases do, but not Oracle. Using a CASE statement in the WHERE clause. g. custom How do I use a Case statement to achieve this in the WHERE clause? sql; sql-server; Share. e. SQL Server - using CASE in WHERE clause. Ask Question Asked 11 years, 9 months ago. You can look to the case as a value, so you have to put an operator between the case and the other operand. Try this - parses & executes just fine (on SQL 2008 R2): "select * from sys. You can combine them thusly: declare @ProductType int = 1 declare @Products as Table ( ProductLine VarChar(16) ) insert into @Products ( ProductLine ) values ( 'TVs' ), ( 'Books' ) select * from @Products . Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company SQL Server CASE Statement Forms. If PartName = B, then i should apply (RecoveraleFlag = 1) condition along with other conditions. If we would like to filter the data on Staff (in the WHERE clause) or on StaffCount (in the HAVING clause), PL/SQL Using CASE in WHERE clause. The SQL CASE statements lets you implement conditional logic directly in SQL. – The WHERE clause is specifically designed to test conditions against raw data (individual rows of the table). customerid, c. ContactID , c. CASE clause statement in Additionally, the End=1 will conclude the CASE statement by including only those rows in the result that return 1. CASE in WHERE clause - passing multiple values. Basically what i am trying to do is if the start day is Saturday and the end day is Sunday, then add 10080(one week) to the end offset/vend offset and if it does not meet that condition, then use the original values. table_name t CROSS JOIN ( SELECT CASE $1 WHEN 'a' THEN 0 WHEN 'b' THEN 1 . ELSE shouldn't have any conditions, it is used to catch everything which doesn't match any of the conditions in case statement it is attached to. DECLARE @Active BIT=0 SELECT * FROM Foo WHERE firstname = 'a' AND active = CASE WHEN @Active=1 THEN @Active ELSE Active END unless your in clause was stupidly large, which shouldn't really happen from user input. What I have is a stored procedure that does a select based on its inputs. The CASE expression has two formats: The simple CASE expression compares an expression to a set of simple expressions to determine the result. If not, the where clause for date would be between start of current year and today. I think you mean the following: how do you use coalesce to say all rows if null otherwise only rows that match. Id and Table2. Hot Network Questions Using telekinesis to minimize the effects of g force on the human body Custom (external) reference voltage for ADC: is there a lower limit? SQL Switch/Case in where clause. The CASE statement is one of the most flexible and powerful constructs in SQL. The GROUP BY clause aggregates all the records by the values returned in the first column of the SELECT. The HAVING clause restricts the titles to those that are held by salaried employees with a the SQL statement is not written correct. [DataInfo] @Allowactive BIT = 1 AS BEGIN Select * from tbl1 1 where (CASE @Allowactive WHEN 0 then (t. You cannot put the entire conditional inside. Tiago converted the where clause to a SARG which gives the optimizer more options (even though the optimizer could decide not to use an index at that point in time). roleid = roledef. A CASE expression in the WHERE clause makes no sense, as you can always say the same with simple AND and/or OR. Price , p. So this won't work: select case when 1=1 then 1 in (1,2,3) end But this will work; select case when 1=1 then 1 end The value can be the result of a subquery. Hot Network Questions It's very hard to tell what you are trying to do, but considering the example provided, each of the three "subqueries" return some value which is compared to some other value in an IN clause. FirstName gets referenced first. I’m commonly asked whether whether I can have a CASE Statement in the WHERE Clause. Commented Jan 16, SQL Case Statement in Where Clause. A case statement must result in a value, not an expression. @QMaster Because CASE works like this: "Evaluates a list of conditions and returns ONE of multiple possible result expressions. SQL: Case when being called in a where clause. Issue with BETWEEN in CASE statement in WHERE clause. I have to add one condition in the WHERE clause depending upon specific value (49) of the field (activity. The result of the case statement is either 1 or 0. Therefore, CASE by itself cannot produce a complete boolean expression; it can only produce the value used on one side of a +1 I'd just comment that the ELSE clause is unnecessary (NULL is the default anyway) but on the other hand it does perhaps add clarity. CASE statement in WHERE clause : Teradata. SQL/PLSQL Oracle query: CASE in WHERE statement. there are different values other than 99999 to worry about), make sure to indicate that information as well. TxnID, CASE AlarmEventTransactions. SQL> SELECT empno, comm FROM emp WHERE NVL(comm, 9999) = NVL2(:a, NVL(comm, The idea behind my case statement is to check the variable for usage and perform a like if the name, ssn, or drlicense are partial entries. Viewed 81k times 7 what im trying to do is to make a query consider or not a datetime value so i dont have to do this in a stored procedure. For example: Table. SQL CASE statement with table and operator. type). CalendarYear, or d. SELECT id, name, case when complex_with_subqueries_and_multiple_when END AS d FROM table t WHERE d IS NOT NULL LIMIT 100, OFFSET 100; But i would like to use the decode on the whare clause. T-SQL CASE in WHERE Clause and IN operator. Show us exact input and output if you want to be completely clear here. When the report is called the user will have all 6 parameters listed. Improve this answer T-SQL where clause case statement. See the syntax and examples of simple and searched CASE expressions in SELECT, WHERE, and HAVING clauses. declare @x int = null select case when @x is null then 1 else 2 end --> 1 Unlike MySQL You can't use column aliases in the having clause in SQL Server. where in select statement. Case Statement in SQL using Like. See syntax, arguments, return types, remarks and In the T-SQL scripting language, you can use the SQL CASE statement to evaluate a condition and return one or more result expressions. Commented Apr 16, 2014 at 9:35 Using IN() within a CASE statement in Oracle APEX SQL. I want to rewrite this query: select * from Persons P where P. It returns a value. Select all tuples from X table provided it has no duplicate email values. Name From mstCity With the scan above I meant a plain scan (table scan in case of a heap or clustered index scan) which the optimizer is forced to do if you give it a CASE in the where. case when in. 2. DATAAREAID = 'USMF', and ss. Oracle with CASE Statement in WHERE clause. Well, the SQL Case statement is a great start. ParkID FROM tblc c JOIN tblsc ON c. Yet many developers never fully utilize its capabilities for conditional logic, data analysis and transformation. FROM T1, T2 WHERE CASE T2. It is not a statement, and cannot be used for control of flow like it can in other languages. Use of case in MySQL LIKE query. One case statement for multiple parameters. Just use boolean expressions: Where (ss. Filtering on CASE Statement on WHERE clause including variable. IN is a clause that may be part of a query. Further, each WHEN clause in a searched CASE statement contains a condition that evaluates to either true or SQL Server: CASE statement in WHERE clause with IN condition. case statement in where clause SQLSERVER. I don't have enough reputation to add a comment to your post, but it sounds like you want to add another case statement. You should be able to adapt this successful experiment: SELECT 'boom' WHERE 'a' NOT IN ( SELECT CASE WHEN 1=0 THEN 'a' ELSE '' END UNION ALL SELECT CASE WHEN 1=1 THEN 'b' ELSE '' END ) The reason your case doesn't work is that null is not equal to null. Using array-like functionality sql server multi case where clause. This example might help you, the picture shows how SQL case statement will look like when there are if and more than one inner if loops. 32. If the variable is not zero the first part is false and the CustID field must match the variable. , :to) is case in where clause in SQL. Hot Network Questions White perpetual check, where Black manages a check too? A CASE statement can return only one value. There are a number of examples using the CASE WHEN construct in SQL, such as the SELECT columns or in ORDER BY clauses, but we tend to forget CASE can be used wherever an expression is expected. ID LEFT JOIN tblp p ON sc. DATAAREAID <> 'USMF' and ss. Name NOT IN ('USA','UK') )) OR (2=@condition AND Name IN (SELECT AliasCity. – Ishamael Commented Oct 16, 2012 at 23:08 Summary: in this tutorial, you will learn how to use the Oracle CASE expression to add if-else logic to the SQL statements. table_a as a INNER JOIN dbo. SOME_TYPE NOT LIKE 'NOTHING%' END I know that my WHERE is clause is not correct. EmployeeName, Employee. . year + I'm trying to change the criteria for a where clause based on a case statement. WHERE 1 = CASE WHEN @UserRole = 'Analyst' THEN CASE WHEN The main difference between simple and searched CASE statements lies in how they handle conditions. CASE expressions require that they be evaluated in the order that they are defined. Thanks in advance – guri Commented Sep 13, 2012 at 6:42 Following oracle query complies and works fine: SELECT Employee. podiluska's answer is correct if you care about using case statement. Use table aliases that are abbreviations for the table names. This SQL Tutorial will teach you when and how you can use CASE in T-SQL What Does the SQL CASE Statement Do? The CASE statement allows you to perform an IF-THEN-ELSE check within an SQL statement. If you omit the ELSE clause and the expression does F. It allows you to use comparison operators with CASE, but also means that CASE cannot return multiple values. The WHERE clause is specifically for making Boolean evaluations, so using CASE within the WHERE clause is usually a misstep. Hot Network Questions What does the Canada's Access to Information Act entail for reference letters? What if a potential employer knows that you are A solution that doesn't use a CASE WHEN in the WHERE clause, is probably the better approach. It seems that using case statement for conditions is not true and its for values. , :from) is given, then I need to get the records from SAMPLE_TABLE whose BIRTHDATE >= :from 2) if only to date (which is a param i. WHERE u. If you are still not getting case sensitive results then go with iLike operator. Himanshu Case expression in where clause PL/SQL. However, MAX is an aggregate function over multiple rows of data. edit: For instance, Rails does this a lot behind the scenes A Jet database's Autonumber field is a special case of a Jet long integer field and has a range of -2,147,483,648 to 2,147,483,647 -- that's a lot of numbers. Using Case When and Between as condition in where clause. Your condition translates to: WHERE rule = 'IND' OR rule = NULL As rule = NULL is never true (it would have to be rule IS NULL for this to work), the condition is essentially a mere. ; Fourth, the COUNT() function returns the total orders. org for A11 labeled as an inversion, when its lowest pitch note is an A? A loan company wants to loan me money & wants to deposit $400 tin my account for verification Did Arab Christians use the word "Allah" before I want to filter on a case statement in my where clause for example: Select name, address, case when code in (50000-8113, 512388-8114) then ‘M345’ else ‘N/A’ end as Mucode Where mucode = ‘ sql with case in where clause. In T-SQL, CASE is an expression that returns a single value from one of the branches. if @considerDate =1 begin select * from table where dateCol = @date end else begin select The problem with the case (as you have written it) is that Oracle does not treat the value from a logical expression as a valid value. MySQL Case in Select Statement with LIKE operator. ITEMGROUPID like 'SW%' and ss. The CASE expression evaluates a list of conditions and returns one of the multiple possible results. I have use case where I need to write a query which contains case statement in where clause with conditions like below : I have column in 'SAMPLE_TABLE' called 'BIRTHDATE' 1) if only from date (which is a param i. id WHERE a. What you can do is use it as a query cross joined to the table: SELECT t. SP will be like - I want to use a case statement in a where clause. SQL Server CASE expression in WHERE clause to check NULL value. starttime >= b. Using CASE statements in WHERE clause. My question is: how do I account for the case of NULL in the table column (i. When I tried one query, I was getting the following error: Msg 4108 Level 15 State 1 Line 3 Windowed functions can Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Nto sure which RDBMS you are using, but if it is SQL Server you could look at rather using a CASE statement. table_b as b ON a. – marc_s. if the flag is Yes then i want all the id where the column name is not null. 5. SQL Server - WHERE clause with CASE. Basically, without a sub-select, the WHERE clause knows nothing about any rows in the table except for the current row. What I’m trying to do is, if my current month is Jan, then the where clause for date is between start of previous year and today. Also you can compare it by changing the case using Upper() method. ID= p. Else This condition should not apply but all other conditions should remain. If that's the case I would do something like COALESCE(@MiddleName, '') = '' OR @MiddleName=[MiddleName] in the where clause. 145 I'm using SQL Server, how do I use a CASE statement within a where clause in a SQL statement?. SQL Server : case when in where clause. Ilyes. The CASE expression has two formats: simple CASE and searched CASE. Microsoft SQL CASE statement in where clause using LIKE. ; SQL Server searched CASE expression. T-SQL Case Condition in Where Clause. starttime ELSE SELECT 1, 2 FROM dbo. Commented Jan 22 at 16:59. id = b. The above runs in both SQL-Server and MySQL but it doesn't return the result I expected. I guess it has to do with that the field customerid, GROUPed BY and used in the query-subquery join is in the first case PRIMARY KEY of the outer table and in the second case it's not. The problem is likely the comparison to NULL, as explained in David Spillett's answer above. Learn how to use the CASE statement in the WHERE clause to apply conditional logic to filter rows in SQL Server. I tried to google for CaseStatement in WHERE clause. BusinessId) Thanks Ian Clelland for reply, Your Query is working But I want to use Case Statement, could u pls clarify me about case statament in where clause. And you are violating this within your then clause. Any help would be great in knowing if this type of statement is possible. ID WHERE (stuff = stuff) CASE in T-SQL is an expression (like a+b) which can return only one, atomic value - you cannot use it to conditionally execute entire blocks of code, nor can you return a result set from it – marc_s. eightmonthinc as select * from dbo. Introduction to Oracle CASE expression. After discovering some interesting limitations, I found a way. And SQL Server only grudgingly supports a boolean data type. Since the WHERE clause is inherently a Boolean construct, an attempt to use CASE in the WHERE clause is almost always misguided (as Note that in SQL, string comparison is case-insensitive by default. Because of this, the optimizer will just use a table There are valid uses of a CASE in a WHERE clause, especially to force Oracle to run one predicate before another (eg check a string only contains digits before doing a TO_NUMBER on it ) Switch case in where clause (sql server) 0. Using CASE in WHERE If you're using case in a where clause, it needs to be on one side of the operator: CASE @case_value WHEN 0 THEN some_column ELSE some_other_column END = @some_value However, if you try to make your actual condition fit this rule, you'll end up not using the case statement at all, as @Joel point out. They can create the report with one or all of the parameters. ) I like that you wrapped this in parens, because it makes it clear that this approach can be extended to allow for other "optionally supplied" search parameters e. CASE WHEN EXISTS in WHERE clause. Try to replace your CASE with AND-OR combination. roleid AND rolename IN ( CASE WHEN (1 < 2) THEN ('Owner I know I can use CASE statement in an SQLite query but I don't know how to built it in a WHERE clause. 13. Hot Network Questions Why is this image from pianochord. You select only the records where the case statement results in a 1. In the OP, the case will resolve as NULL, which will result in the WHERE clause effectively selecting WHERE AND NULL, which will always fail. It returns the value for the first when clause that is true. 0 Licensed Software to only one person? I have a SQL Statement where I have to check on conditions on rows since it has duplicates. Note the use of is as opposed to =:. So one solution would be to rewrite the where clause like: @user2343837 The thing you have to remember about a CASE statement in SQL is that it's really a function. Case when in sql oracle. How would be the right syntax for that CASE WHEN in I'm trying to use a case when clause in a where statement to return values if they fall into 2 different categories. ". WHERE rule = 'IND' You seem to want something entirely The case statement in SQL returns a value on a specified condition. Commented Jan 6, 2016 at 15:23. sql; SQL Server Where clause with Case Checking null value. Name From mstCity AliasCity WHERE AliasCity. If you put a WHERE clause it filters that data in advance and can use an index to optimize the query. WHERE a. ColumnName != '' is equivalent to e. START_PLACE_ID to where clause if both are greater than zero then i need to append both the cases to the where CASE is an expression that returns a value. Then, for each different value of order_category, COUNT(order_id) will calculate the total number of orders belonging to the corresponding The SQL CASE expression allows you to evaluate a list of conditions and returns one of the possible results. We can use a Case statement in select queries along with Where, Order By, and Group By clause. How to use case statement inside where clause in oracle? 1. uunt davbeej ozqm ftnars pbgiyx nwfe dyhxj xwbhd aunci ralrqzqt