SQL :每个会员第一次操作的数量

SELECT * FROM    
                          (    SELECT   ROW_NUMBER ()   OVER ( PARTITION   BY   markuser   ORDER   BY   MarkTime   ASC   )   AS   rid ,
                            *   FROM   
                            (   SELECT     his . markuser , MarkTime , COUNT ( 1 )   AS   num
                            
                            -- his.markuser
                     FROM      liebowh . StoreHouse . ReturnGoodsdetail   detail
                             LEFT   JOIN   CallCentre . CC . ReturnGoodsInfoHistory   his   ON   detail . returngoodsid   =   his . returngoodid
                             GROUP   BY    his . markuser , MarkTime )   aa
                        
                             )   bb  
                             WHERE   rid = 1  AND   markuser = 471