In PostgreSQL, the Drop function statement is used to remove a function. Only the table owner, the schema owner, and superuser can drop a table. > > Why we can DROP TABLE CASCADE, DROP VIEW CASCADE, DROP SEQUENCE CASCADE but we can’t DROP USER/ROLE CASCADE? For example The DROP VIEW statement removes a view from the database. The first drop statement requires a cascade because there is a dependent little table that holds a foreign key constraint against the primary key column of the big table. Summary: in this tutorial, you will learn how to use the PostgreSQL DROP VIEW statement to remove one or more views from the database.. Introduction to PostgreSQL DROP VIEW statement. > > Why do Postgres have no such functionality as DROP USER CASCADE? ; Third, use CASCADE to delete schema and all of its objects, and in turn, all objects that depend on those objects. 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. Use the drop function statement with the cascade option to drop a function and its dependent objects and objects that depends on those objects, and so on. Is there any reasons in that absence? asked Oct 7 '15 at 7:44. smac89 smac89. Drop the big and little table if they exists. Specify the argument list in the function if the function is overloaded. ; Second, use the IF EXISTS option to conditionally delete schema only if it exists. Description. To remove the extension hstore from the current database:. drop the foreign key, add a foreign key with on delete cascade, and finally; commit the transaction; Repeat for each foreign key you want to change. But PostgreSQL has a non-standard extension that lets you use multiple constraint clauses in a single SQL statement. In this syntax: First, specify the name of the schema from which you want to remove after the DROP SCHEMA keywords. DROP SCHEMA public CASCADE; CREATE SCHEMA public; GRANT ALL ON SCHEMA public TO postgres; GRANT ALL ON SCHEMA public TO public; COMMENT ON SCHEMA public IS 'standard public schema'; Also note to issue these commands in pgAdmin III, I used the Query tool ( magnifying glass icon "Execute abritrary SQL queries") or you could use Plugins-> PSQL Console share | improve this question | follow | edited May 30 '16 at 18:40. smac89. USE WITH CARE - This will drop all rows of all tables which have a foreign key constraint on some_table and all tables that have constraints on those tables, etc. My Personal Notes arrow_drop_up. If you want to delete schema only when it is empty, you can use the RESTRICT option. Syntax: drop function [if exists] function_name(argument_list) [cascade ... Use the drop function statement with the cascade option to drop a function and its dependent objects and objects that depends on those objects, and so on. Postgres supports CASCADE with TRUNCATE command: TRUNCATE some_table CASCADE; Handily this is transactional (i.e. Add the CASCADE option to forcibly remove those dependent objects as well. postgresql foreign-key cascade drop-table. Use drop function statement to remove a function. DROP TABLE removes tables from the database. When you remove a column from a table, PostgreSQL will automatically remove all of the indexes and constraints that involved the dropped column.. You can do drop owned by user_name; drop user user_name; … Examples. The second drop statement does not require the cascade keyword because there is not a dependent foreign key constraint. The following illustrates the syntax of the DROP … Alex Ignatov (postgrespro) schrieb am 19.10.2016 um 12:26: > Hello! 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