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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

1 Answer

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by (40.3k points)

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

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