Tag: cascade

Order of cascaded deletes in postgres

I encountered a problem which makes me suspect Postgres deletes rows from dependent tables (ON DELETE CASCADE) only after it already deleted the original row. I have these tables: I created a trigger (before delete) on the function_inclusion table: Let’s say I have 2 functions and a function_inclusion: …

Delete from child table with two parents without cascade delete in sql server

cascade parent-child sql sql-delete sql-server

I need your guidance. I create a script to delete from 3 tables separately. meaning when I created the script is to delete from table3 (child) then delete from 2 (child), then delete from table1(parent) I am having problem with Table3 since table2 has foreign key both for table2 and table1 so I cannot delete …

PostgreSQL: FOREIGN KEY/ON DELETE CASCADE

cascade postgresql sql

I have two tables like here: So the logic is simple, after user removes all book under category x, x gets removed from cats, i tried method above but doesn’t work, after i clean table book, table category still populated, what’s wrong? Answer A foreign key with a cascade delete means that if a rec…