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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 · CASE WHEN (ID IS NULL) THEN 'YES' ELSE 'NO' END AS ID_Value, I only have access to 2008 right now, but I'd hope that this syntax would still work in 2005 (seems like something that would be part of the original definition of CASE).
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 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.
1 Answer. Sorted by: 8. Why this happens has already been answered by @PaulWhite in the SO question: How does this CASE expression reach the ELSE clause? To solve it, you should calculate the ABS (CHECKSUM (NEWID ()))%10 +1 outside/before the INSERT statement so it is calculated once. Something like:
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.
1 sie 2017 · You can check if a field or variable is equal to NULL because all comparisons to NULL return NULL (which in a CASE or IF predicate is taken as meaning false), so WHEN <FieldOrVariable> = NULL THEN <output> and WHEN <FieldOrVariable> <> NULL THEN <output> will never match.
