> ALTER TABLE A COLUMN AA ADD CONSTRAINT DELETE ON CASCADE. > Veja isto: > > CONSTRAINT fcgruper_index_2 FOREIGN KEY (funcao) > REFERENCES criarq.fcfuncao (codigo) MATCH SIMPLE > ON UPDATE CASCADE ON DELETE CASCADE > Esta é a parte final de uma tabela onde ele tem um relacionamento com a > tabela fcfuncao e quando o código dela for alterado o … ... Change constraint you have in table_y on the column to have option ON DELETE CASCADE. Like this: > create table A (x int primary key); > create table B (y int primary key, z int references A (x) ); > As you can see, i've not specified any further 'on delete' clause to the > foreign key constraint like 'on delete cascade' or 'on delete … ... DELETE and ON DELETE CASCADE constraint option. While a CHECK constraint that violates this rule may appear to work in simple tests, it cannot guarantee that the database will not reach a state in which the constraint condition is false (due to … I have an existing foreign key that has ON DELETE NO ACTION defined. postgresql on delete cascade. With the below table structure, we can see three FOREIGN KEY constraints. We will follow this order to update the FOREIGN KEY‘s.. Use ALTER TABLE command to drop any existing FOREIGN KEY‘s. Finally, assuming you have a column that *has* a fkey constraint, but not the additional "ON DELETE CASCADE" portion, how would you go about adding "ON DELETE CASCADE" to the column? ; Use ALTER TABLE command to add the needed FOREIGN KEY‘s back to the table. Now I want to fix that. From the > documentation on www.postgresql.org, about ALTER TABLE it's not at > all clear how to do this or even whether you can do this. if that fkey constraint includes "ON DELETE CASCADE"? ALTER TABLE table_y DROP CONSTRAINT constraint_name, ADD CONSTRAINT constraint… Shruthi A <[hidden email]> wrote: > I have 2 tables (A and B) where the table B has a foreign key reference to > table A. TIA,-Jon PS: PostgreSQL … On Wed, Nov 17, 2010 at 11:32:32AM -0500, Aram Fingal wrote: > I have a table where I should have declared a foreign key with ON > UPDATE CASCADE and didn't. > > ALTER TABLE foo DROP CONSTRAINT your_constraint; > > ALTER TABLE foo ADD FOREIGN KEY ...; > > COMMIT; > > The nice thing about the ALTER TABLE statement is that you can do it > in one command: > > > ALTER TABLE foo > DROP CONSTRAINT your_constraint, > ADD CONSTRAINT your_constraint FOREIGN KEY ... > ON UPDATE CASCADE ON DELETE … You can do it like this: BEGIN; ALTER TABLE foo DROP CONSTRAINT … Try. To add a not-null constraint to a column: ALTER TABLE distributors ALTER COLUMN street SET NOT NULL; To remove a not-null constraint from a column: ALTER TABLE distributors ALTER COLUMN street DROP NOT NULL; To add a check constraint to a table and all its children: ALTER TABLE distributors ADD CONSTRAINT … Referential actions are applied on changes to the primary key side of the constraint … You're missing the specification of the foreign key, not to mention spelling the CASCADE clause backwards. ALTER TABLE A ADD FOREIGN KEY(AA) REFERENCES B(BB) ON DELETE CASCADE > \h alter table seems to be missing any way to add a constraint … Note: PostgreSQL does not support CHECK constraints that reference table data other than the new or updated row being checked. ¨é›†ï¼š 外部キーは既に存在し、外部キー列にデータ … Current Structure. Stephan Szabo I think you want ALTER TABLE "second" DROP CONSTRAINT "$1"; ALTER TABLE "second" ADD CONSTRAINT "secondfk" FOREIGN KEY (name) REFERENCES "first"("record_num") ON DELETE CASCADE; No. 2016-08-24 08:32:13 GMT [32532]: [1559-1] db=postgres,user=user,app=psql,client=[local] LOG: statement: ALTER TABLE reason_tender ADD CONSTRAINT reason_tender_fk2 FOREIGN KEY (id_bsngp,tender_type_code) REFERENCES as_tnd(id_bsngp,ty_tnd) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE; … 2016-08-24 08:32:52 GMT [32585]: [499-1] db=postgres,user=postgres… I need to change this foreign key to ON DELETE CASCADE.I can do this within a transaction: begin; alter table posts drop constraint posts_blog_id_fkey; alter table posts add constraint posts_blog_id_fkey foreign key (blog_id) references blogs (id) on update no action on delete cascade… I've tried the various "\d"-type commands in psql to no avail. Photo by Richard Payette on Unsplash Steps. 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