PostgreSQL
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# DELETE

## Name

DELETE — Removes rows from a table

    DELETE FROM table [ WHERE condition ]

### Inputs

`table`

  The name of an existing table.

`condition`

  This is an SQL selection query which returns the rows which are to be deleted.

  Refer to the SELECT statement for further description of the WHERE clause.

### Outputs

`DELETE `count``

  Message returned if items are successfully deleted. The `count` is the number of rows deleted.

  If `count` is 0, no rows were deleted.

## Description

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 Postgres extension which provides a faster mechanism to remove all rows from a table.

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`.

## Usage

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 | 1961-01-03 | Musical | 02:32
     TC901 | The King and I            | 109 | 1956-08-11 | 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)

## Compatibility

### SQL92

SQL92 allows a positioned DELETE statement:

    DELETE FROM table WHERE
        CURRENT OF cursor

where `cursor` identifies an open cursor. Interactive cursors in Postgres are read-only.

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