PLS-00618: type mismatch found at 'string' between operands
in a NULLIF expression
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Answer / guest
Cause: In a NULLIF expression, the two operands do not match
in datatype, and it is unclear which implicit conversion is
required to correct the mismatch.
Action: Change the operands so that their datatypes match.
Consider using datatype conversion functions in the operands.
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