How to fix the Oracle error QSM-01621: join backs to base tables not allowed with an equivalence?

In this post, you’ll learn more about the Oracle ErrorQSM-01621: join backs to base tables not allowed with an equivalence with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

QSM-01621: join backs to base tables not allowed with an equivalence

Reason for the Error QSM-01621: join backs to base tables not allowed with an equivalence

Query rewrite needs to do a join back to a base table column to answer this query. But join back is not allowed for an equivalence rewrite

How to fix the Error QSM-01621: join backs to base tables not allowed with an equivalence ?

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

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