SQL 子句“GROUP BY 1"是什么意思?意思是?

问题描述

有人向我发送了一个 SQL 查询，其中 GROUP BY 子句包含以下语句:GROUP BY 1.

Someone sent me a SQL query where the GROUP BY clause consisted of the statement: GROUP BY 1.

这一定是打错字了吧?没有列被赋予别名 1.这意味着什么?我是否正确地认为这一定是一个错字?

This must be a typo right? No column is given the alias 1. What could this mean? Am I right to assume that this must be a typo?

推荐答案

意思是按第一列分组，不管它叫什么.你可以用 ORDER BY 做同样的事情.

It means to group by the first column regardless of what it's called. You can do the same with ORDER BY.

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