Oracle分组取第一条数据

对多数据进行分组排序后取每组第一条记录

Sql代码

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

Sql代码

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

作者：刘亚飞