group by(A+B)和group by A,B 的区别?
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group by(A+B)和group by A,B 的区别?
![group by(A+B)和group by A,B 的区别?](/uploads/image/z/4765597-61-7.jpg?t=group+by%28A%2BB%29%E5%92%8Cgroup+by+A%2CB+%E7%9A%84%E5%8C%BA%E5%88%AB%3F)
排序的条件不同
最后结果的列数也不同
最后结果的列数也不同
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