group by 1 什么意思
时间: 2023-08-15 17:15:13 浏览: 203
引用\[1\]中提到了关于SQL中的"GROUP BY 1"的解释。这个语法是指按照查询结果中的第一个列进行分组。而不是按照表中的第一列进行分组。\[2\]中的例子也验证了这一点,通过在"GROUP BY"后面跟着数字1,可以实现按照查询结果中的第一个列进行分组。这种写法可以简化代码,特别是当要聚合的内容很长时。\[3\]中的例子展示了如何使用"GROUP BY 1"来简化复杂的聚合语句。所以,"GROUP BY 1"的意思是按照查询结果中的第一个列进行分组。
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