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;
我相信这将工作在MysqL(我的背景)，但它似乎不工作在postgres。我得到的错误是：
ERROR: Syntax error at or near "join" LINE 1: update vehicles_vehicle v join shipments_shipment s on v.shi... ^
UPDATE syntax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 ] [,...] ]
在你的情况下，我想你想要：
UPDATE vehicles_vehicle AS v SET price = s.price_per_vehicle FROM shipments_shipment AS s WHERE v.shipment_id = s.id
