In this post, you’ll learn more about the Oracle ErrorORA-38501: sub-query not allowed in the expression with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-38501: sub-query not allowed in the expression
Reason for the Error ORA-38501: sub-query not allowed in the expression
An attempt was made to use a sub-query in the expression.
How to fix the Error ORA-38501: sub-query not allowed in the expression ?
You can fix this error in Oracle by following the below steps
Do not use sub-queries in the expressions.