How to drop all foreign keys in database?

Deleting all foreign keys can be done by querying the system tables and droping them one by one. If you use Firebird 2 or higher, it can be done with a single SQL statement:

set term !! ;

EXECUTE BLOCK RETURNS (stmt VARCHAR(1000)) AS
BEGIN
FOR
select 'alter table '||r.rdb$relation_name ||' drop constraint '||r.rdb$constraint_name||';'
from rdb$relation_constraints r
where (r.rdb$constraint_type='FOREIGN KEY')
into :stmt
DO begin suspend; execute statement :stmt; end
END!!

set term ; !!

If you use Firebird 1.x, you can run the following query to get statements to execute and then copy/paste the result and execute:

select 'ALTER TABLE '||r.rdb$relation_name
||' DROP CONSTRAINT '||r.rdb$constraint_name||';'
from rdb$relation_constraints r
where (r.rdb$constraint_type='FOREIGN KEY')

Do you find this FAQ incorrect or incomplete? Please e-mail us what needs to be changed. To ensure quality, each change is checked by our editors (and often tested on live Firebird databases), before it enters the main FAQ database. If you desire so, the changes will be credited to your name. To learn more, visit our add content page.