sql - 带有连接的 Postgresql 更新

Question

我想加入 2 个表并根据第二个表的指定值更新第一个表的值。我使用其他解决方案失败了。

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

Answer 1

一般更新语法:

[ 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 ] [, ...] ]

解决你的问题:

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

有关 UPDATE 语法的更多信息，请访问以下链接:

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