Question

(SELECT IDOperatore FROM operatore) MINUS 
(SELECT IDOperatore FROM commessaoperatore GROUP BY IDOperatore)

即使我尝试将MINUS替换为EXCEPT，此查询也无效。单数查询SELECT IDOperatore FROM operatore和SELECT IDOperatore FROM commessaoperatore GROUP BY IDOperatore正在运行，但如果我尝试与Minus运算符放在一起，则它们无效。

错误：＃1064 - 您的SQL语法出错;查看与MySQL服务器版本对应的手册，以便在第1行“MINUS（SELECT IDOperatore FROM commessaoperatore GROUP BY IDOperatore）”附近使用正确的语法

Answer 1

mysql中不存在MINUS

但是对于您的查询，您可以使用NOT EXISTS：

SELECT IDOperatore FROM operatore o
WHERE NOT EXISTS (SELECT 1
                 FROM commessaoperatore c 
                 WHERE c.IDOperatore = o.IDOperatore)

SQL查询运算符减号不起作用

1 个答案: