TRUNCATE

Empties a table of all rows.

Synopsis

TRUNCATE [TABLE] <name> [, ...] [CASCADE | RESTRICT]

Description

TRUNCATE quickly removes all rows from a table or set of tables. It has the same effect as an unqualified DELETE on each table, but since it does not actually scan the tables it is faster. This is most useful on large tables.

You must have the TRUNCATE privilege on the table to truncate table rows.

Parameters

name: The name (optionally schema-qualified) of a table to be truncated.
CASCADE: Since this key word applies to foreign key references (which are not supported in Greenplum Database) it has no effect.
RESTRICT: Since this key word applies to foreign key references (which are not supported in Greenplum Database) it has no effect.

Notes

TRUNCATE will not run any user-defined ON DELETE triggers that might exist for the tables.

TRUNCATE will not truncate any tables that inherit from the named table. Only the named table is truncated, not its child tables.

TRUNCATE will not truncate any sub-tables of a partitioned table. If you specify a sub-table of a partitioned table, TRUNCATE will not remove rows from the sub-table and its child tables.

Examples

Empty the table films:

TRUNCATE films;

Compatibility

There is no TRUNCATE command in the SQL standard.