How to fix the Oracle error PLS-00397: Type mismatch in arguments to IN?

In this post, you’ll learn more about the Oracle ErrorPLS-00397: Type mismatch in arguments to IN with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00397: Type mismatch in arguments to IN

Reason for the Error PLS-00397: Type mismatch in arguments to IN

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

How to fix the Error PLS-00397: Type mismatch in arguments to IN ?

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.