如何在PostgreSQL中进行更新+加入? [英] How to do an update + join in PostgreSQL?

问题描述

基本上，我想这样做:

update vehicles_vehicle v 
    join shipments_shipment s on v.shipment_id=s.id 
set v.price=s.price_per_vehicle;

我很确定这可以在MySQL(我的背景)中使用，但似乎在postgres中不起作用.我得到的错误是:

I'm pretty sure that would work in MySQL (my background), but it doesn't seem to work in postgres. The error I get is:

ERROR:  syntax error at or near "join"
LINE 1: update vehicles_vehicle v join shipments_shipment s on v.shi...
                                  ^

当然有一种简单的方法可以做到这一点，但是我找不到合适的语法.那么，我将如何在PostgreSQL中编写此代码?

Surely there's an easy way to do this, but I can't find the proper syntax. So, how would I write this In PostgreSQL?

推荐答案

UPDATE语法是:

[ 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 ] [, ...] ]

在您的情况下，我认为您想要这样做:

In your case I think you want this:

UPDATE vehicles_vehicle AS v 
SET price = s.price_per_vehicle
FROM shipments_shipment AS s
WHERE v.shipment_id = s.id 

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