sqlserver_分組排序取第一組數據

     select t1.dwbh, t1.bm,t1.bslb from
    (
        select dwbh, bm, bslb, 
        row_number() OVER (PARTITION BY dwbh,bm ORDER BY rq desc) num 
        from bsdwxdls where dwbh='DWI00000095'
    ) t1 where t1.num = 1