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UPDATE(7)				   SQL Commands 				UPDATE(7)

       UPDATE - update rows of a table

       UPDATE [ ONLY ] table SET col = expression [, ...]
	   [ FROM fromlist ]
	   [ WHERE condition ]

       table  The  name (optionally schema-qualified) of an existing table. If ONLY is specified,
	      only that table is updated. If ONLY is not specified, the table and all its descen-
	      dant  tables  (if any) are updated. * can be appended to the table name to indicate
	      that descendant tables are to be scanned, but in the current version, this  is  the
	      default  behavior.  (In  releases  before  7.1, ONLY was the default behavior.) The
	      default can be altered by changing the SQL_INHERITANCE configuration option.

       column The name of a column in table.

	      A valid expression or value to assign to column.

	      A PostgreSQL non-standard extension to allow columns from other tables to appear in
	      the WHERE condition.

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

       UPDATE #
	      Message returned if successful.  The # means the number of rows updated.	If # is 0
	      no rows are updated.

       UPDATE changes the values of the columns specified for all rows which  satisfy  condition.
       Only the columns to be modified need appear as columns in the statement.

       Array  references use the same syntax found in SELECT [select(7)].  That is, either single
       array elements, a range of array elements or the entire array may be replaced with a  sin-
       gle query.

       You  must  have write access to the table in order to modify it, as well as read access to
       any table whose values are mentioned in the WHERE condition.

       By default UPDATE will update 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.

       Change word Drama with Dramatic on column kind:

       UPDATE films
       SET kind = 'Dramatic'
       WHERE kind = 'Drama';
       SELECT *
       FROM films
       WHERE kind = 'Dramatic' OR kind = 'Drama';

	code  |     title     | did | date_prod  |   kind   | len
	BL101 | The Third Man | 101 | 1949-12-23 | Dramatic | 01:44
	P_302 | Becket	      | 103 | 1964-02-03 | Dramatic | 02:28
	M_401 | War and Peace | 104 | 1967-02-12 | Dramatic | 05:57
	T_601 | Yojimbo       | 106 | 1961-06-16 | Dramatic | 01:50
	DA101 | Das Boot      | 110 | 1981-11-11 | Dramatic | 02:29

       SQL92 defines a different syntax for the positioned UPDATE statement:

       UPDATE table SET column = expression [, ...]

       where cursor identifies an open cursor.

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