order by跟group by 跟having----------------sum() 求和 avg()求平均 count() 求个数--------------like
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group by 后面加select中那些没有放在聚合函数中的参数:比如这个句子应该是加“sex”;
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聚合函数有sum() 求和 avg()求平均 count() 求个数
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having关键字,打个不太恰当的比方,相当于where关键字,相对于筛选条件,具体查看备注
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order by 是指按照那个排序。desc是倒序排序
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order by 1就是升序排序,也就是默认排序,正常排序
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备注:
where 子句的作用是在对查询结果进行分组前,将不符合where条件的行去掉,即在分组之前过滤数据,条件中不能包含聚组函数,使用where条件显示特定的行。
having 子句的作用是筛选满足条件的组,即在分组之后过滤数据,条件中经常包含聚组函数,使用having 条件显示特定的组,也可以使用多个分组标准进行分组。
having 子句被限制子已经在SELECT语句中定义的列和聚合表达式上。通常,你需要通过在HAVING子句中重复聚合函数表达式来引用聚合值,就如你在SELECT语句中做的那样。例如:
SELECT A COUNT(B) FROM TABLE GROUP BY A HAVING COUNT(B)>2
order by跟group by 跟having----------------sum() 求和 avg()求平均 count() 求个数--------------like的更多相关文章
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