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DROP PROCEDURE

DROP PROCEDURE — remove a procedure

Synopsis

DROP PROCEDURE [ IF EXISTS ]name [ ( [ [argmode ] [argname ]argtype [, ...] ] ) ] [, ...]    [ CASCADE | RESTRICT ]

Description

DROP PROCEDURE removes the definition of one or more existing procedures. To execute this command the user must be the owner of the procedure(s). The argument types to the procedure(s) usually must be specified, since several different procedures can exist with the same name and different argument lists.

Parameters

Notes

If there is only one procedure of the given name, the argument list can be omitted. Omit the parentheses too in this case.

InPostgreSQL, it's sufficient to list the input (includingINOUT) arguments, because no two routines of the same name are allowed to share the same input-argument list. Moreover, theDROP command will not actually check that you wrote the types ofOUT arguments correctly; so any arguments that are explicitly markedOUT are just noise. But writing them is recommendable for consistency with the correspondingCREATE command.

For compatibility with the SQL standard, it is also allowed to write all the argument data types (including those ofOUT arguments) without anyargmode markers. When this is done, the types of the procedure'sOUT argument(s)will be verified against the command. This provision creates an ambiguity, in that when the argument list contains noargmode markers, it's unclear which rule is intended. TheDROP command will attempt the lookup both ways, and will throw an error if two different procedures are found. To avoid the risk of such ambiguity, it's recommendable to writeIN markers explicitly rather than letting them be defaulted, thus forcing the traditionalPostgreSQL interpretation to be used.

The lookup rules just explained are also used by other commands that act on existing procedures, such asALTER PROCEDURE andCOMMENT ON PROCEDURE.

Examples

If there is only one proceduredo_db_maintenance, this command is sufficient to drop it:

DROP PROCEDURE do_db_maintenance;

Given this procedure definition:

CREATE PROCEDURE do_db_maintenance(IN target_schema text, OUT results text) ...

any one of these commands would work to drop it:

DROP PROCEDURE do_db_maintenance(IN target_schema text, OUT results text);DROP PROCEDURE do_db_maintenance(IN text, OUT text);DROP PROCEDURE do_db_maintenance(IN text);DROP PROCEDURE do_db_maintenance(text);DROP PROCEDURE do_db_maintenance(text, text);  -- potentially ambiguous

However, the last example would be ambiguous if there is also, say,

CREATE PROCEDURE do_db_maintenance(IN target_schema text, IN options text) ...

Compatibility

This command conforms to the SQL standard, with thesePostgreSQL extensions:

See Also