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

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

Cause: 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.

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

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