How to Handle OR Logic in SQL Server CASE Expressions Without the OR Operator?

OR Operator Not Supported in CASE Expression in SQL Server: Alternative Solutions

The OR operator is not supported in the WHEN clause of a CASE expression in SQL Server. This can present challenges when you need to evaluate multiple conditions using OR logic. To overcome this limitation, you can employ alternative approaches:

Separate WHEN Clauses:

One option is to use separate WHEN clauses for each condition. This approach requires multiple conditions in the CASE statement. For example:

CASE ebv.db_no 
  WHEN 22978 THEN 'WECS 9500' 
  WHEN 23218 THEN 'WECS 9500'  
  WHEN 23219 THEN 'WECS 9500' 
  ELSE 'WECS 9520' 
END as wecs_system

IN Operator:

Another alternative is to use the IN operator. The IN operator allows you to specify a list of values to compare with the evaluation expression. For example:

CASE  
  WHEN ebv.db_no IN (22978, 23218, 23219) THEN 'WECS 9500' 
  ELSE 'WECS 9520' 
END as wecs_system 

By utilizing either of these approaches, you can handle OR logic in CASE expressions even though the OR operator itself is not supported. Choose the approach that best aligns with the requirements of your specific query.

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