sql server 获取某一字段分组数据的前十条记录

1、sql 语法

select m, n from ( select row_number () over (partition by m order by n desc) rn,--以m分组，分组内以n倒序排列求每组中各自的序号
 m, n from table
    where ... ) w where w.rn <=10;序号小于10 order by m, n desc

2、案例获取每个月前十大客户数据

原来数据

案例sql

select StatDate, OrderCount, AmountTotal, CustomerUnitPrice from ( select row_number () over (partition by t.StatDate order by t.AmountTotal desc) rn, *
   from ( select 
         CONVERT(varchar(7), AuditTime, 120) StatDate, FBM_USER_ID CustomerId, Count(1) OrderCount, sum(isnull(FBM_BLL_BOOK_TOTAL,0)) AmountTotal, case when sum(isnull(FBM_BLL_BOOK_TOTAL,0)) >0 then Round((sum(isnull(FBM_BLL_BOOK_TOTAL,0)) / Count(1) + 0.0), 4) else  0 end as CustomerUnitPrice from F_CUST_BOOK_MSTR b where auditStatus=2 and AuditTime is not null
        and AuditTime>='2017-06-01'
        group by CONVERT(varchar(7), AuditTime, 120),FBM_USER_ID ) t ) tt where rn <=10
order by StatDate desc

查询结果