Postgresql Update with join

问题:

I want to join 2 tables and update value of firts table on specified value of 2nd table. I failed using others solutions.

UPDATE customers
SET cutoffstop = cutoffstop + '432000'
FROM customers as c
JOIN bluemedia as b ON c.id = b.customerid
WHERE b.orderid = '217201807'

回答1:

General Update Syntax:

[ WITH [ RECURSIVE ] with_query [, ...] ]
UPDATE [ ONLY ] table [ [ AS ] alias ]
    SET { column = { expression | DEFAULT } |
          ( column [, ...] ) = ( { expression | DEFAULT } [, ...] ) } [, ...]
    [ FROM from_list ]
    [ WHERE condition | WHERE CURRENT OF cursor_name ]
    [ RETURNING * | output_expression [ [ AS ] output_name ] [, ...] ]

Solution for you problem:

UPDATE customers AS c
SET cutoffstop = cutoffstop + 432000
FROM bluemedia as b
WHERE c.id = b.customerid
AND b.orderid = '217201807'

For more information on UPDATE syntax follow the below link:

https://www.postgresql.org/docs/current/static/sql-update.html

回答2:

You could use EXISTS

UPDATE customers c
SET c.cutoffstop = c.cutoffstop + '432000'
WHERE EXISTS (
        SELECT 1
        FROM bluemedia b
        WHERE c.id = b.customerid
            AND b.orderid = '217201807'
        );

回答3:

Use this query for updation:

UPDATE customers
SET cutoffstop = cutoffstop + 432000
FROM bluemedia as b ON customers.id = b.customerid
WHERE b.orderid = '217201807'