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15 mar 2013 · You need to check for null explicitly: SELECT CASE WHEN last_name is NULL THEN first_name ELSE first_name + ' ' + last_name
11 lip 2012 · 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
3 wrz 2024 · If no input_expression = when_expression evaluates to TRUE, the SQL Server Database Engine returns the else_result_expression if an ELSE clause is specified, or a NULL value if no ELSE clause is specified.
The SQL CASE Expression. The CASEexpression 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 ELSEclause.
case might not work with null. Use coalesce or isnull. declare @t table(data varchar(10) null) insert into @t values('something') insert into @t values(null) select data, case coalesce(data, 'missing') when 'missing' then 'missing'. else 'not missing'.
This tutorial shows you how to use the SQL Server CASE expression to add if-else logic to SQL queries with many practical examples.
The CASE expression in SQL server allows us to apply if-then-else logic in a SQL statement. A CASE consists of a number of conditions with an accompanying custom result value in a case body followed by an optional ELSE clause.
