Conditionally apply AND condition

Question

CREATE OR REPLACE PROCEDURE SP_TFS_REPORT (LoginId IN STRING,
status IN STRING,
fromAmount IN STRING DEFAULT NULL,
toAmount IN STRING DEFAULT NULL,
accNumber IN STRING,
result_cursor OUT SYS_REFCURSOR)
IS
BEGIN
OPEN result_cursor FOR SELECT * FROM TEST_TABLE T1
WHERE T1.LOGIN_ID = LoginId AND
T1.STATUS = status AND
T1.FROM_AMOUNT >= to_number(fromAmount) AND --This needs to be applied only if fromAmount paramter is not null*
T1.TO_AMOUNT <= to_number(toAmount) AND --This needs to be applied only if fromAmount paramter is not null*
T1.ACCOUNTNUMBER = accNumber;
COMMIT;
As you can see 'fromAmount' and 'toAmount' are optional paramters to the stored procedure. So the AND conditions corresponding to them need to be conditionally applied. In other words they need to be applied only when I get a NOT NULL value.
I know we can do this using IF ELSE condition but is there any efficient way to do this?
My DB details are:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE 11.1.0.7.0 Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production
Thanks in advance for any help!!

Answer 1

Hi,
Sure, you can use CASE in a WHERE clause, but there's usually no benefit in doing so.
Why not
WHERE   T1.LOGIN_ID     = LoginId
AND     T1.STATUS      = status
AND     T1.FROMAMOUNT      >= nvl ( to_number (l_fromAmount1)
                           , T1.FROMAMOUNT
AND     T1.FROMAMOUNT   <= nvl ( to_number (l_fromAmount2)
                            , T1.FROMAMOUNT
AND     T1.ACCOUNTNUMBER = accNumber; ?
This assumes t1.fromamount is not NULL.
It looks like you've changed your requirements: earlier, you were interested in t1.from_amount and t1.to_amount, and now only t1.fromamount.