Oracle Error PLS-00616: type mismatch found at ‘string’ among result expressions in a CASE expression

Oracle Error Message

PLS-00616: type mismatch found at ‘string’ among result expressions in a CASE expression

Reason for the Error

In a CASE expression, the result expressions do not match in datatype, and it is unclear which implicit conversion is required to correct the mismatch.

Solution

Change the result expressions so that their datatypes match. Consider using datatype conversion functions in the result expressions.