within group
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within group语句和group by没有半毛钱关系,只是一些单值聚合函数的辅助关键字
下面举例简单的进行说
SELECT * from employees
则如果一个员工的薪水为1500,那么该员工在员工表中的薪水排名应与WangWu相同,并列排名第三。
select rank(1500) within group (order by salary) as "rank number" from employees;
查询结果为
0 0
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