在SQL语句中,select,where,group by,having,order by,这几个关键字程序执行顺序是怎样的?比如这个查询语句：select T1.USERNAME AS '员工姓名',T2.DEPTNAME as '部门名称',sum(T3.BILLMNY) AS '出账收入',sum(T4.LOSTMNY) AS

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在SQL语句中,select,where,group by,having,order by,这几个关键字程序执行顺序是怎样的?比如这个查询语句：select T1.USERNAME AS '员工姓名',T2.DEPTNAME as '部门名称',sum(T3.BILLMNY) AS '出账收入',sum(T4.LOSTMNY) AS

在SQL语句中,select,where,group by,having,order by,这几个关键字程序执行顺序是怎样的?比如这个查询语句：select T1.USERNAME AS '员工姓名',T2.DEPTNAME as '部门名称',sum(T3.BILLMNY) AS '出账收入',sum(T4.LOSTMNY) AS
在SQL语句中,select,where,group by,having,order by,这几个关键字程序执行顺序是怎样的?
比如这个查询语句：
select T1.USERNAME AS '员工姓名',T2.DEPTNAME as '部门名称',sum(T3.BILLMNY) AS '出账收入',sum(T4.LOSTMNY) AS '欠费',sum(T5.PLANMNY) AS '计划值',(SUM(T3.BILLMNY)-SUM(T4.LOSTMNY) )/SUM(T5.PLANMNY) AS '完成率'
from USERINFO AS T1,DEPT AS T2,BILLMNY AS T3,LOSTMNY AS T4,PLANMNY AS T5,DEVPEPO AS T6
where T1.USERID=T5.USERID AND T1.USERID=T6.USERID and T6.DEVPEPO=T3.DEVPEPO AND T6.DEVPEPO=T4.DEVPEPO AND T1.DEPTID=T2.DEPTID AND T5.PLANMNY0
group by T1.USERNAME,T2.DEPTNAME
order by (SUM(T3.BILLMNY)-SUM(T4.LOSTMNY) )/SUM(T5.PLANMNY)

在SQL语句中,select,where,group by,having,order by,这几个关键字程序执行顺序是怎样的?比如这个查询语句：select T1.USERNAME AS '员工姓名',T2.DEPTNAME as '部门名称',sum(T3.BILLMNY) AS '出账收入',sum(T4.LOSTMNY) AS
以下为我理解的：
select 你要找的结果
where 找结果的条件
group by 用那些来给结果分组
having 和where 差不过也是条件
order by 给结果排序

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