Joining tables on fields with varying lengths - response (4) by dnoeth

I would strongly recommend to change the join-condition to a less resource-consuming and easier-to-understand

INNER JOIN TABLE B ON A.ACCT_NB = TRIM(LEADIMNG '0' FROM B.ACCT_NUM)

In fact, both are bad and in best case you should try to clean up both your data model and data.