How Can I Replicate CASE WHEN Functionality in MS Access Queries Using ODBC?

CASE WHEN Clause in MS Access with ODBC Connectivity

When accessing data from Microsoft Access through ODBC, it's crucial to consider the database's native SQL syntax. While other databases may support the CASE WHEN clause, Access requires an alternative approach.

ODBC Support for CASE WHEN in Access

ODBC does not inherently support the CASE WHEN clause for MS Access. Attempts to use it may result in an "Expression Not Recognizable" error.

Database Compatibility and Workarounds

To ensure compatibility across various databases, finding a common approach for computing boolean columns is essential. However, MS Access requires a different syntax:

• For MS Access: SELECT AGE > 10 FROM demo
• For other databases (with CASE WHEN support): SELECT (CASE WHEN (AGE > 10) THEN 1 ELSE 0 END) FROM demo

Alternative Solution for MS Access

As an alternative to the CASE WHEN clause, MS Access employs the Switch() function to evaluate multiple return values based on conditions:

SELECT SWITCH(
  AGE > 40, 4,
  AGE > 25, 3,
  AGE > 20, 2,
  AGE > 10, 1,
  TRUE, 0
) FROM demo

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