Let's say I have 3 tables.
Tab_1 has a PK on t1_col1
tab_2 has a foreign key on t2_col1 which references t1_col1
tab_3 has a foreign key on t3_col1 which references t2_col1
if I set my foreign key constraint in table 2 with a on delete set null option, this means that deleting primary key values from table 1 sets those columns on t2_col1 to null.
What happens to the values in t3_col1, do they become null as well, or remain the same..?