连接不起作用的SQL更新我在这里缺少什么？

Question

我不知道为什么会一直回来：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM vendas LEFT JOIN clientes c ON c.id = vendas.idCliente AND c.idRespons' at line 2

Mysql查询：

UPDATE vendas 
FROM vendas
LEFT JOIN clientes c ON c.id = vendas.idCliente AND c.idResponsavel IS NOT NULL
LEFT JOIN funcionarios f ON f.id = c.idResponsavel
SET vendas.idVendedorResponsavel = f.id
WHERE vendas.idVendedorAtendente is NULL

Answer 1

试试这个

UPDATE vendas v

LEFT JOIN clientes c 
ON c.id = v.idCliente 
AND c.idResponsavel IS NOT NULL

LEFT JOIN funcionarios f 
ON f.id = c.idResponsavel

SET v.idVendedorResponsavel = f.id
WHERE v.idVendedorAtendente is NULL

Answer 2

你可以像这样离开FROM vandas条款

UPDATE vendas v
LEFT JOIN clientes c ON c.id = v.idCliente AND c.idResponsavel IS NOT NULL
LEFT JOIN funcionarios f ON f.id = c.idResponsavel
SET v.idVendedorResponsavel = f.id
WHERE v.idVendedorAtendente is NULL

Answer 3

您无法在UPDATE规范中所述的MySQL Update Query中设置这样的from子句： http://dev.mysql.com/doc/refman/5.0/en/update.html

我相信你想要的是这样的：

UPDATE vendas LEFT JOIN clientes c ON c.id = vendas.idCliente AND c.idResponsavel IS NOT NULL
LEFT JOIN funcionarios f ON f.id = c.idResponsavel
SET vendas.idVendedorResponsavel = f.id
WHERE vendas.idVendedorAtendente is NULL