Update Table

Overview

Update table statement supports table name or alias to reference column.

Syntax

[ WITH [ RECURSIVE ] with_query [, ...] ]
UPDATE [ ONLY ] table_name [ * ] [ [ AS ] alias ]
    SET { [ table_name | alias ] column_name = { expression | DEFAULT } 
| ( [ table_name | alias ] column_name [, ...] ) = [ ROW ]    ( { expression | DEFAULT } [, ...] )
| ( [ table_name | alias ] column_name [, ...] ) = ( sub-SELECT )
        } [, ...]
    [ FROM from_list ]
    [ WHERE condition | WHERE CURRENT OF cursor_name ]
    [ RETURNING * | output_expression [ [ AS ] output_name ] [, ...] ]

Parameters

table_name Table name.
alias Table alias.
column_name Table column.
expression Value expression.
sub-SELECT Select sub query.
from_list Table expression.
condition A expression which return boolean value.
cursor_name The name of the cursor to be used in the WHERE CURRENT OF situation.
output_expression After each row is deleted, it will be calculated and returned by DELETE.
output_name The name of the column being returned.

Example

create table tb_test5(id int, flg char(10));

insert into tb_test5 values(1, '2'), (3, '4'), (5, '6');

update tb_test5 a set a.id = 33 where a.id = 3;

table tb_test5;
Id  |    flg
----+------------
  1 | 2
  5 | 6
 33 | 4
(3 rows)