利用partition分组查询 查询每个分组第一条数据

利用partition分组查询 查询每个分组第一条数据

数据库：sqlserver （其他数据库没有尝试）

row_number() over(partition by year(createtime),month(createtime),day(createtime),glsort ORDER BY createtime DESC)

over(partition by 分组条件)

row_number() over(partition by year(createtime),month(createtime),day(createtime),glsort ORDER BY createtime DESC)

over(partition by 分组条件 order by 排序条件(必须))

select * from
(
    select glsort,createtime, sort,id,
    row_number() over(partition by year(createtime),month(createtime),day(createtime),glsort ORDER BY createtime DESC) as new_index 
    from BusinessInformation 
    where isExamine=1
)
a where a.new_index = 1 ORDER BY a.sort desc, year(a.createtime)desc ,month(a.createtime) desc,day(a.createtime) desc