Does MS Access ODBC Support the CASE WHEN Clause?

Does the ODBC Interface for MS Access Support the CASE WHEN Clause?

While attempting to connect to MS Access via ODBC, you encountered an exception when executing a query utilizing the CASE WHEN clause. This exception prompts the question: Does ODBC support this clause for MS Access?

Understanding the Compatibility Issue

Despite its support for comparison operators in SELECT clauses, MS Access does not natively support the CASE WHEN clause. However, to address this limitation, ODBC provides a workaround mechanism.

Alternative Approach for MS Access

To achieve the desired functionality in MS Access through ODBC, consider employing the switch() function. The switch() function enables you to evaluate multiple conditions and return corresponding values:

select switch(
  age > 40, 4,
  age > 25, 3,
  age > 20, 2,
  age > 10, 1,
  true, 0
) from demo

Each condition is evaluated in sequence, and if it meets the threshold, the corresponding value is returned. The final case, true, acts as a default and handles situations where none of the other conditions are met.

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