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TRUNCATE -- empty a table or set of tables


TRUNCATE [ TABLE ] name [, ...]


TRUNCATE quickly removes all rows from a 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.



The name (optionally schema-qualified) of a table to be truncated.


Only the owner of a table may TRUNCATE it.

TRUNCATE cannot be used on a table that has foreign-key references from other tables, unless all such tables are also truncated in the same command. Checking validity in such cases would require table scans, and the whole point is not to do one.

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


Truncate the tables bigtable and fattable:

TRUNCATE TABLE bigtable, fattable;


There is no TRUNCATE command in the SQL standard.


Jan. 24, 2006, 5:22 p.m.

There are difference between truncate on PostgreSQL and Oracle.

truncate table X;
rollback; -- on Oracle is no rolback now

On Oracle you can't roll it back after truncate.

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