How to fix the Oracle error ORA-25955: all tables must be joined in the where clause?

In this post, you’ll learn more about the Oracle ErrorORA-25955: all tables must be joined in the where clause with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-25955: all tables must be joined in the where clause

Reason for the Error ORA-25955: all tables must be joined in the where clause

An attempt to create a join index was made, which failed because one of the tables in the from clause did not appear in the where clause.

How to fix the Error ORA-25955: all tables must be joined in the where clause ?

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

Ensure that the where clause contains all from clause tables.