Drop Foreign Key without knowing the name of the constraint?

Question

I have created one table using below command:

create table Table1(
    Id int Not Null 
        Foreign key 
        references Table2(Id)  
        on delet         


        

Answer 1

Never mind, below is Postgres syntax. It would be better if the question had sql server in the title as I didn't notice the tag

You could also drop and re-add the primary key on the parent table using cascade. This will remove any foreign keys that reference that table without you needing to know the foreign key names.

ALTER TABLE parent_table
DROP CONSTRAINT 'pk_id' CASCADE

-- add back pk
ALTER TABLE parent_table
ADD CONSTRAINT 'pk_id' PRIMARY KEY (id)

WARNING: you'd want to check all the dependencies first and if there are other tables, you'd need to add back their foreign keys. That does allow you to name the foreign keys properly when you add them back. This approach also may not be viable in a high transaction system due to the blocking transaction.