Tiffany Thang <tiffanythang@gmail.com> writes: > I would like to write a SQL statement to drop all the tables owned by me > but a problem I’m struggling with is with referential integrity. The > statement I have now to generate the drop statements is
> select 'drop table '||tablename||' cascade;' from pg_tables where > tableowner='<myuseraccount>';
> The generated SQLs above might attempt to drop the parent tables first > before the child and to be able to drop all the tables, I had to run the > SQL script in multiple iterations. Not very clean.
Uh ... it's not clear to me why that wouldn't work. CASCADE should be able to take care of foreign keys:
postgres=# create table t1 (f1 int primary key); CREATE TABLE postgres=# create table t2 (f2 int references t1); CREATE TABLE postgres=# drop table t1; ERROR: cannot drop table t1 because other objects depend on it DETAIL: constraint t2_f2_fkey on table t2 depends on table t1 HINT: Use DROP ... CASCADE to drop the dependent objects too. postgres=# drop table t1 cascade; NOTICE: drop cascades to constraint t2_f2_fkey on table t2 DROP TABLE
Could you enlarge on what problem you saw, specifically?
regards, tom lane
Thanks Tom for your response. I tried it again and I was not able to reproduce the issue.
