How to creare function to work with EXISTS function

Question

Hello,
I would need some help with code in where clause. I have 6 queries which has a same condition:
AND NOT EXISTS (SELECT 0
FROM TAB1 T1
WHERE T1.COL1 = T2.COL1
AND T1.COL2 = T2.COL2)
I would like to write some function so I don't have to change a code in every statement:
AND NOT EXISTS FUNCTION1(T2.COL1, T2.COL2);
I wonder if that is possible. I was searching forum and documentation but did not find nothing useful. I do not know what type of function must be and how this could work. If someone now please help.
Regards,
Igor

Answer 1

user5528050 wrote:
Hello,
I would need some help with code in where clause. I have 6 queries which has a same condition:
AND NOT EXISTS (SELECT 0
FROM TAB1 T1
WHERE T1.COL1 = T2.COL1
AND T1.COL2 = T2.COL2)
I would like to write some function so I don't have to change a code in every statement:
AND NOT EXISTS FUNCTION1(T2.COL1, T2.COL2);
I wonder if that is possible. I was searching forum and documentation but did not find nothing useful. I do not know what type of function must be and how this could work. If someone now please help.
Regards,
IgorHello
If your 6 queries are hitting the same tables but are applying different where clauses i.e. filters, you might benefit from creating a view to encapsulate the common SQL. That way you only have to implement the core logic once and you can have your 6 queries go to the view... i.e.
CREATE OR REPLACE VIEW v_myview
AS
SELECT
   a,b,c,d....
FROM
   t2....
WHERE
    NOT EXISTS (SELECT 0
                       FROM TAB1 T1
                       WHERE T1.COL1 = T2.COL1
                       AND T1.COL2 = T2.COL2)
select * from v_myview WHERE a = 100
/HTH
David