Sql Server Select Case When Null

Sql Server Select Case When Null - How do you check for NULL in a CASE statement when you re using a Scalar Function My original query was but it fails SELECT CASE dbo fnCarerResponse WHEN NULL THEN Pass ELSE Fail END I read the SO question about using IS NULL like so SELECT CASE dbo fnCarerResponse IS NULL WHEN NULL THEN Pass ELSE Fail END CASE can be used in any statement or clause that allows a valid expression For example you can use CASE in statements such as SELECT UPDATE DELETE and SET and in clauses such as select list IN WHERE ORDER BY and HAVING Transact SQL syntax conventions Syntax Syntax for SQL Server Azure SQL Database and Azure Synapse Analytics syntaxsql Jan 31 2018 at 14 04 2 If the sub query returns more than one row the original will raise an error EXISTS wont So they aren t always the same If the sub query is correlated and guaranteed to return 0 or 1 rows per outer row you might also consider outer join and checking for null in the CASE Martin Smith Jan 31 2018 at 14 19

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Sql Server Select Case When Null

How To Use Select Case In Sql Server YouTube

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Microsoft SQL Server Classroom Lesson 08 Introduction To SQL Expressions

Microsoft sql server classroom lesson 08 introduction to sql expressions

CASE statement with IS NULL and NOT NULL Ask Question Asked 11 years 5 months ago Modified 7 years 10 months ago Viewed 209k times 15 Is there any better way to write the lines below in SQL Server 2005 CASE WHEN ID IS NULL THEN YES WHEN ID IS NOT NULL THEN NO END AS ID Value sql server sql server 2005 Share Improve this question

2 Answers Sorted by 14 CASE x WHEN null THEN is the same as CASE WHEN x null THEN But nothing equals null in that way This means that you are always getting the ELSE part of your CASE statement And that means that you are trying to concatenate a string with NULL which always yields NULL You need CASE WHEN x IS NULL THEN instead

Sql Server SQL Case When Returning The Incorrect Results Stack

Sql server sql case when returning the incorrect results stack

Sql Server 2012 SQL Query CASE WHEN Statement Stack Overflow

Sql server 2012 sql query case when statement stack overflow

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The SQL CASE Expression The CASE expression goes through conditions and returns a value when the first condition is met like an if then else statement So once a condition is true it will stop reading and return the result If no conditions are true it returns the value in the ELSE clause

4 There s no ELSE in your first CASE which means if none of your WHEN expressions are matched then it returns NULL My guess is there s an issue in your logic below that causes date1 and date2 to always be equal which would miss both your WHEN s in the first CASE and return NULL Share Improve this answer