How to Alter Constraint

sql oracle

user1777711 · Nov 6, 2012 · Viewed 165.3k times · Source

SQL How to Alter Constraint

Below is 1 of my constraint

CONSTRAINT ACTIVEPROG_FKEY1 FOREIGN KEY(ActiveProgCode) REFERENCES PROGRAM(ActiveProgCode),

I want to add in

ON DELETE CASCADE

to the constraint above.

How do i alter that existing constraint ACTIVEPROG_FKEY1 and add

ON DELETE CASCADE

to constraint ACTIVEPROG_FKEY1

Consider ACTIVEPROG_FKEY1 is at Table ACTIVEPROG

Answer

You can not alter constraints ever but you can drop them and then recreate.

Have look on this

ALTER TABLE your_table DROP CONSTRAINT ACTIVEPROG_FKEY1;

and then recreate it with ON DELETE CASCADE like this

ALTER TABLE your_table
add CONSTRAINT ACTIVEPROG_FKEY1 FOREIGN KEY(ActiveProgCode) REFERENCES PROGRAM(ActiveProgCode)
    ON DELETE CASCADE;

hope this help