In this post, you’ll learn more about the Oracle ErrorQSM-01602: equivalence, string, requires join back to table, string, on column, string with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
QSM-01602: equivalence, string, requires join back to table, string, on column, string
Reason for the Error QSM-01602: equivalence, string, requires join back to table, string, on column, string
A column in the query does not appear in the equivalence. Query rewrite will try to obtain this column from the base table, by doing a join back to that column with a materialized view. But join backs are not allowed for equivalence rewrite as the required constraints are not guaranteed to be found on the tables in the destination statement of the equivalence.
How to fix the Error QSM-01602: equivalence, string, requires join back to table, string, on column, string ?
You can fix this error in Oracle by following the below steps
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