Question

我必须消除那些名为“奥斯卡”的技术人员 2010年。

我必须首先删除他们执行的修理，然后删除名为“Oscar”的技术人员。我在两个陈述中这样做：

DELETE FROM Reparacion  WHERE cuit_tec IN(SELECT Tec.cuit
            FROM Tecnico Tec 
            WHERE Tec.nombre like 'oscar%'
            AND NOT EXISTS(SELECT 1 
                    FROM Reparacion Rep
                    WHERE Rep.cuit_tec = Tec.cuit 
                    AND Fecha BETWEEN '2010-01-01' AND '2010-12-31'));

和

DELETE FROM 
    Tecnico AS Tec 
WHERE 
    Nombre like 'oscar%' AND 
    NOT EXISTS (SELECT 
                1 
            FROM 
                Reparacion AS Rep 
            WHERE 
                Rep.Cuit_tec = Tec.Cuit AND 
                Fecha BETWEEN '2010-01-01' AND '2010-12-31');

这会抛出错误消息：

"Error Code: 1093. You can not specify target table 'Repair' for update in FROM clause"
"Error Code: 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 'AS Tec WHERE Name = 'oscar' AND NOT EXISTS (SELECT 1 FROM R ' at line 2 "

sqlfiddle：http://sqlfiddle.com/#!2/9438d

Answer 1

这里不是错误：

WHERE 
    Nombre like= 'oscar%' AND

必须Nombre like 'oscar%' AND

删除两个表会产生错误

1 个答案: