DELETE FROM [ ONLY ] table [ WHERE condition ]
DELETE removes rows which satisfy the WHERE clause from the specified table.
If the condition (WHERE clause) is absent, the effect is to delete all rows in the table. The result is a valid, but empty table.
Tip: TRUNCATE is a PostgreSQL extension which provides a faster mechanism to remove all rows from a table.
By default DELETE will delete tuples in the table specified and all its sub-tables. If you wish to only update the specific table mentioned, you should use the ONLY clause.
You must have write access to the table in order to modify it, as well as read access to any table whose values are read in the condition.
Remove all films but musicals:
DELETE FROM films WHERE kind <> 'Musical'; SELECT * FROM films; code | title | did | date_prod | kind | len -------+---------------------------+-----+------------+---------+------- UA501 | West Side Story | 105 | 1961年01月03日 | Musical | 02:32 TC901 | The King and I | 109 | 1956年08月11日 | Musical | 02:13 WD101 | Bed Knobs and Broomsticks | 111 | | Musical | 01:57 (3 rows)
Clear the table films:
DELETE FROM films; SELECT * FROM films; code | title | did | date_prod | kind | len ------+-------+-----+-----------+------+----- (0 rows)