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我正在学习 SQL,有人可以告诉我查询有什么问题吗?

SELECT * FROM customers AS C
Inner Join customers AS CC
on CC.City=C.City
INNER JOIN customers AS CCC
ON
CCC.City=C.City

我使用带有 MYSQL 的“虚拟数据库”进行查询测试。

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1 回答 1

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尝试这样做:

SELECT C.* FROM customers C 
Inner Join customers CC 
on CC.City=C.City 
INNER JOIN 
customers CCC ON CCC.City=C.City 
于 2012-06-18T14:55:29.563 回答