Postgresql constraint

Question

I cannot seem to get this right, I am trying to modify a field to be a foreign key, with cascading delete... what am i doing wrong?

ALTER TABLE my_table 
ADD CON         


        

Answer 1

I'm still somehow missing here an answer with foreign column (foreign_field) explicitly specified:

ALTER TABLE my_table
ADD CONSTRAINT my_fk
FOREIGN KEY (my_field)
REFERENCES my_foreign_table (foreign_field)
ON DELETE CASCADE;