Optimization of greater than operator

Question

credit table and validtransaction table have million record data from year 2008 onwards.

We are doing a migration. So I need to find out the credittypeids which are no

Answer 1

This should return your (distinct!) list of CREDITTYPEID that were used in the past, but are not used curretnly (after PERIODSEQ 1055)

SELECT CREDITTYPEID  /* used before 1055 */
FROM CREDITTYPE ct
WHERE PERIODSEQ < 1055
MINUS
SELECT CREDITTYPEID /* used after 1055 */
FROM CREDITTYPE ct
WHERE PERIODSEQ>=1055;

As the column name suggest CREDITTYPEID is a type so there are several rows in the table with the same typeId.

The query above return only the distinct list and uses no hash anti join.

You may add parallel option (with the PARALLEL hint) if your HW allows it.