Shruthi A <[hidden email]> wrote: > I have 2 tables (A and B) where the table B has a foreign key reference to > table A. Now I want to fix that. Note: PostgreSQL does not support CHECK constraints that reference table data other than the new or updated row being checked. 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? Current Structure. 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… 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 … TIA,-Jon PS: PostgreSQL … You're missing the specification of the foreign key, not to mention spelling the CASCADE clause backwards. I've tried the various "\d"-type commands in psql to no avail. We will follow this order to update the FOREIGN KEY‘s.. Use ALTER TABLE command to drop any existing FOREIGN KEY‘s. > ALTER TABLE A COLUMN AA ADD CONSTRAINT DELETE ON CASCADE. > > 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 … With the below table structure, we can see three FOREIGN KEY constraints. postgresql on delete cascade. ; Use ALTER TABLE command to add the needed FOREIGN KEY‘s back to the table. > 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 … ... DELETE and ON DELETE CASCADE constraint option. ALTER TABLE table_y DROP CONSTRAINT constraint_name, ADD CONSTRAINT constraint… 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 … Ask Question Asked 8 years, 5 months ago. 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. Photo by Richard Payette on Unsplash Steps. I have an existing foreign key that has ON DELETE NO ACTION defined. 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 … You can do it like this: BEGIN; ALTER TABLE foo DROP CONSTRAINT … Referential actions are applied on changes to the primary key side of the constraint … if that fkey constraint includes "ON DELETE CASCADE"? 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. ; Verify new keys are in place and updated. 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. ... Change constraint you have in table_y on the column to have option ON DELETE CASCADE. 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 … ¨é›†ï¼š 外部キーは既に存在し、外部キー列にデータ … Try. 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… Column to have option on DELETE CASCADE '' ; Use ALTER TABLE A column AA ADD constraint…... 'Ve tried the various `` \d '' -type commands in psql to no avail update the FOREIGN key.. Change constraint you have in table_y on the column to have option on DELETE CASCADE DROP constraint,... Months ago can see three FOREIGN key, not to mention spelling the clause. Photo by Richard Payette on Unsplash Steps are in place and updated months.... 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