Postgres ON DELETE CASCADE A Comprehensive Guide
What is the ON DELETE CASCADE Option The ON DELETE CASCADE query is an option that can be used when defining a foreign key constraint When ON DELETE CASCADE is specified Postgres automatically deletes any row in the child table that references a deleted row from the parent table
PostgreSQL DELETE CASCADE With Examples CommandPrompt Inc , In PostgreSQL a DELETE CASCADE is a powerful feature that is useful when you have multiple tables linked with each other via foreign key constraints When a DELETE CASCADE feature is enabled deleting a record from the referenced parent table will also delete the referencing records from the child table
PostgreSQL Documentation 16 DROP TABLE
CASCADE Automatically drop objects that depend on the table such as views and in turn all objects that depend on those objects see Section 5 14 RESTRICT Refuse to drop the table if any objects depend on it This is the default Examples To destroy two tables films and distributors DROP TABLE films distributors Compatibility
How can I drop all the tables in a PostgreSQL database , 1 2 Next 1968 If all of your tables are in a single schema this approach could work below code assumes that the name of your schema is public DROP SCHEMA public CASCADE CREATE SCHEMA public If you are using PostgreSQL 9 3 or later you may also need to restore the default grants
PostgreSQL FOREIGN KEY ON DELETE CASCADE Stack Overflow
PostgreSQL FOREIGN KEY ON DELETE CASCADE Stack Overflow, A foreign key with a cascade delete means that if a record in the parent table is deleted then the corresponding records in the child table will automatically be deleted This is called a cascade delete You are saying in a opposite way this is not that when you delete from child table then records will be deleted from parent table UPDATE 1
Cascade
Postgresql How to add on delete cascade constraints Stack
Postgresql How to add on delete cascade constraints Stack 1 A little OT but I notice that you have not created indexes on referencing columns for example pref scores gid Deletes on the referenced table will take a long time without those if you get many rows in those tables
Cascades Page 26
Sep 8 at 7 52 Add a comment 172 First drop your foreign key and try your above command put add constraint instead of modify constraint Now this is the command ALTER TABLE child table name ADD CONSTRAINT fk name FOREIGN KEY child column name REFERENCES parent table name parent column name ON DELETE CASCADE How to add ON DELETE CASCADE in ALTER TABLE statement. Postgres delete all tables or cascade a delete Ask ion Asked 13 years 3 months ago Modified 12 years 8 months ago Viewed 9k times 5 Is it possible either to delete all rows from all tables with a single command in postgres without destroying the database or to cascade a delete in postgres If not then how can I reset my test database CREATE TABLE btable aid INT NOT NULL UNIQUE CREATE TABLE atable aid INT NOT NULL FOREIGN KEY REFERENCES aid ON DELETE CASCADE then a delete from btable will trigger a delete from atable as well For this to work btable aid should be UNIQUE or a PRIMARY KEY and this is less efficient for mass updates than a set based solution
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