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ROW_NUMBER() OVER函数的基本用法-row-number

来源:互联网 2023-10-01 00:20:02 版权归原作者所有,如有侵权,请联系我们

 

句法:ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN)操作方式01单纯的说row_number()从1已经开始,为每两条各组历史记录回到两个位数,这儿的ROW_NUMBER() OVER (ORDER BY xlh DESC) 是先把xlh列倒序,再为倒序之后的没条xlh历史记录回到两个序列号。meq办公区 - 实用经验教程分享!

02row_number() OVER (PARTITION BY COL1 ORDER BY COL2) 起身依照COL1各组,在各第四组部依照 COL2次序,但此表达式排序的值就起身每第四组部次序后的次序序号(第四组已连续的惟一的)meq办公区 - 实用经验教程分享!

03示例:调用统计数据create table employee (empid int ,deptid int ,salary decimal(10,2))insert into employee values(1,10,5500.00)insert into employee values(2,10,4500.00)insert into employee values(3,20,1900.00)insert into employee values(4,20,4800.00)insert into employee values(5,40,6500.00)insert into employee values(6,40,14500.00)insert into employee values(7,40,44500.00)insert into employee values(8,50,6500.00)insert into employee values(9,50,7500.00)统计数据表明为meq办公区 - 实用经验教程分享!

04市场需求:依照职能部门各组,表明每一职能部门的薪水级别市场预期结论:meq办公区 - 实用经验教程分享!

05SQLJAVA:SELECT *, Row_Number() OVER (partition by deptid ORDER BY salary desc) rank FROM employeemeq办公区 - 实用经验教程分享!

meq办公区 - 实用经验教程分享!


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