对多数据进行分组排序后取每组第一条记录

对多数据进行分组排序后取每组第一条记录

 

SELECT  *
  FROM  ( SELECT  ROW_NUMBER() OVER(PARTITION  BY    ORDER   BY    DESC ) LEV,
               .*
          FROM  )
 WHERE  LEV = 1
 ORDER   BY    DESC

SELECT *
  FROM (SELECT ROW_NUMBER() OVER(PARTITION BY  ORDER BY  DESC) LEV,
               .*
          FROM )
 WHERE LEV = 1
 ORDER BY  DESC

 

-- 分组列 

 

-- 排序列

 

-- 表名

 

-- 排序列

 

注 ：.* -- 一定要有表名，否则会报“缺失表达式”错误

 

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分组时不仅想取每组的第一条记录，还想取每组共有几条记录

SELECT *
FROM (

 

SELECT ROW_NUMBER() OVER(PARTITION BY PK_FINANCE_ACCOUNT ORDER BY amassdate DESC) LEV,
            

             count(0) over(partition by PK_FINANCE_ACCOUNT) cnt,

             

             hx_amass_liquid.*
 FROM

 

 hx_amass_liquid

 

)

 WHERE LEV = 1
 ORDER BY PK_FINANCE_ACCOUNT DESC