How to fix the Oracle error PLS-00383: type mismatch found at ‘string’ inside an IN or NOT IN clause?

In this post, you’ll learn more about the Oracle ErrorPLS-00383: type mismatch found at ‘string’ inside an IN or NOT IN clause with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00383: type mismatch found at ‘string’ inside an IN or NOT IN clause

Reason for the Error PLS-00383: type mismatch found at ‘string’ inside an IN or NOT IN clause

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.

How to fix the Error PLS-00383: type mismatch found at ‘string’ inside an IN or NOT IN clause ?

You can fix this error in Oracle by following the below steps

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