PLS-00383

Error: PLS-00383: type mismatch found at 'string' inside an IN or NOT IN clause

Causa: In a test for set membership such as X NOT IN (SELECT Y ... ), the expressions X and Y do not match in datatype, and it is unclear which implicit conversion is required to correct the mismatch.

Acción: Change the expressions so that their datatypes match. You might want to use datatype conversion functions in the select list.