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RedHat 9 (Linux i386) - man page for delete (redhat section 7)

DELETE(7)				   SQL Commands 				DELETE(7)

       DELETE - delete rows of a table

       DELETE FROM [ ONLY ] table [ WHERE condition ]

       table  The name (optionally schema-qualified) of an existing table.

	      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.

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

	      If count is 0, no rows were deleted.

       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 [truncate(7)] is a PostgreSQL extension which provides a faster mech-
	      anism 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 | 1961-01-03 | 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)

       SQL92 allows a positioned DELETE statement:

       DELETE FROM table WHERE
	   CURRENT OF cursor

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

SQL - Language Statements		    2002-11-22					DELETE(7)

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