partition从字面上看是分区、分块的意思,所以partition by其实就是根据某个字段将数据分块,然后可以对该分块数据再做查询(包括聚合查询)。 例如,partition by常同row_number() over一起使用: selectprovince, city, persons,row_number()over(partitionbyprovinceorderbypersons)fromxzq_person; 这个sql的作用就是根...
AllData AS ( SELECT VEND_NUM, VEND_NAME, RECEIPT_NUM, RECEIPT_ITEM, RECEIPT_DATE, ROW_NUMBER() OVER (PARTITION BY RECEIPT_ITEM ORDER BY RECEIPT_DATE DESC ) AS RN FROM tblVend INNER JOIN tblReceipt ON VEND_NUM = RECEIPT_VEND_NUM WHERE VEND_NUM IN ( '100','200') AND RECEIPT_DATE ...
/*注:这里没有排序条件,若加上orderby排序条件,MAX()OVER(PARTITIONBY..ORDERBY..DESC) 排序规则只能为desc,否则不起作用,将查询到目前为止排序值最高字段的对应值MIN()OVER(PARTITIONBY..ORDERBY..ASC) 排序规则只能为asc,否则不起作用,将查询到目前为止排序值最低的字段的对应值, 如下:*/SELECTE.ENAME, ...
lead(sal, 1, 0) over(partition by deptno order by sal) 比自己工资高的部门前一个, lag(sal, 1, 0) over(partition by deptno order by sal) 比自己工资低的部门后一个, nvl(lead(sal) over(partition by deptno order by sal) - sal, 0) 比自己工资高的部门前一个差额, nvl(sal - lag(sal...
一、rank()/dense_rank() over(partition by ...order by ...) 现在客户有这样一个需求,查询每个部门工资最高的雇员的信息,相信有一定oracle应用知识的同学都能写出下面的SQL语句: select*from(selectename, job, hiredate, e.sal, e.deptno fromemp e, ...
ORACLE_OVER函数 ROW_NUMBER() OVER (PARTITION BY department_id ORDER BY salary DESC) AS row_num FROM employees; ``` 这个查询将为每个部门的员工按工资降序排列,并为每个员工分配一个行号。 ### 示例2:使用SUM()计算... Oracle到mysql转换的问题总结.docx - 序列化函数:Oracle的`ROW_NUMBER() OVE...
Oracle查询中OVER（PARTITIONBY..）用法 Oracle查询中OVER（PARTITIONBY..）⽤法 为了⽅便⼤家学习和测试，所有的例⼦都是在Oracle⾃带⽤户Scott下建⽴的。注：标题中的红⾊order by是说明在使⽤该⽅法的时候必须要带上order by。⼀、rank()/dense_rank() over(partition by ...order by ....
and a.cid in (1, 2, 3) ) group by id,name ,avgsc order by avgsc desc select b.id, b.name, sum(avg(a.score)) over(partition by b.id) avgsc, -- partition by a.id则会报错。 sum(decode(a.cid, 1, a.score, 0)) 语文, ...
select hi,ho, row_number() over(partition by hi,ho) from tbl; But alas, Oracle(and Sql Server too) doesn't allow partition with no ORDER BY; whereas in Postgresql, ORDER BY on PARTITION is optional: http://www.sqlfiddle.com/#!1/27821/1 select hi,ho, row_number() over(partition...
Oraclepartitionby使用说明 Oraclepartitionby使⽤说明--⽤法详解 0、select * from wmg_test; ---测试数据 1、select v1,v2,sum(v2) over(order by v2) as sum --按照 v2排序，累计n+n-1+...+1 from wmg_test;2、select v1,v2,sum(v2) over(partition by v1 order by v2) as sum ...