PostgreSQL DROP TABLE PostgreSQL Tutorial
Introduction to PostgreSQL DROP TABLE statement To drop a table from the database you use the DROP TABLE statement as follows DROP TABLE IF EXISTS table name CASCADE RESTRICT Code language SQL Structured Query Language sql In this syntax First specify the name of the table that you want to drop after the DROP TABLE keywords
Postgresql Drop sequence and cascade Stack Overflow, Only a column DEFAULT drawing from the sequence depends on the sequence and is set to NULL if the sequence is deleted with CASCADE It s the other way round if the sequence is owned by a table column it is dropped with DROP TABLE f1 CASCADE For a sequence to be owned by a table column you can either use the serial type or ALTER an
How does one write a DELETE CASCADE for postgres
Example look at order id CREATE TABLE order items product no integer REFERENCES products ON DELETE RESTRICT order id integer REFERENCES orders ON DELETE CASCADE quantity integer PRIMARY KEY product no order id It can be delegated to DBMS by set a constraint property On delete CASCADE
PostgreSQL Documentation 16 DROP TABLE, Description DROP TABLE removes tables from the database Only the table owner the schema owner and superuser can drop a table To empty a table of rows without destroying the table use DELETE or TRUNCATE DROP TABLE always removes any indexes rules triggers and constraints that exist for the target table However to drop a table that is referenced by a view or a foreign key constraint
How to DROP TABLE in PostgreSQL With Different Examples
How to DROP TABLE in PostgreSQL With Different Examples , Read PostgreSQL DROP COLUMN PostgreSQL DROP TABLE CASCADE sequence If you have created a sequence and used it for a column s default of a table in PostgreSQL then you can remove the table with the sequence associated with it using the DROP TABLE statement with the keyword CASCADE But the sequence has to be owned by the table to be dropped if not then you have to change the owner of
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DROP TABLE CASCADE does not drop any dependent table
DROP TABLE CASCADE does not drop any dependent table The idea behind DROP CASCADE is to automatically remove the dependent objects This is documented on the same manual page that the other answer is referring to CASCADE Automatically drop objects that depend on the table such as views Emphasis mine
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Notes You must have the TRUNCATE privilege on a table to truncate it TRUNCATE acquires an ACCESS EXCLUSIVE lock on each table it operates on which blocks all other concurrent operations on the table When RESTART IDENTITY is specified any sequences that are to be restarted are likewise locked exclusively If concurrent access to a table is required then the DELETE command should be used PostgreSQL Documentation 16 TRUNCATE. Conclusion In PostgreSQL a DELETE CASCADE allows us to delete the records associated with some other tables via foreign key constraints To use a delete cascade in Postgres specify the ON DELETE CASCADE option while creating defining a foreign key constraint By doing so Postgres will automatically delete any rows in the referenced A notice is issued in this case The name optionally schema qualified of the view to remove Automatically drop objects that depend on the view such as other views and in turn all objects that depend on those objects see Section 5 14 Refuse to drop the view if any objects depend on it This is the default
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