SQL 语句 merge into

MERGE INTO   tb_st_shxxcount tt
             USING   (  SELECT   DISTINCT
                                 sd.CODE,
                                 COUNT (ts.LRDW) count1,
                                 TO_CHAR (ts.LRSJ, 'yyyy-MM-DD') YFDATE
                          FROM   TB_RY_BSINFO ts, SYS_DICTITEM sd
                         WHERE       sd.CODE = ts.LRDW(+)
                                 AND sd.groupid = 'CODE_UNIT'
                                 AND ts.lrsj IS NOT NULL
                      GROUP BY   sd.CODE, TO_CHAR (ts.LRSJ, 'yyyy-MM-DD')) TP
                ON   (TT.CJDWDM = TP.CODE
                      AND TO_CHAR (TT.UPDATETIME, 'YYYY-MM-DD') = TP.YFDATE)
        WHEN MATCHED
        THEN
           UPDATE SET TT.BSINFOCOUNT = TP.COUNT1

非循环更新某一个表的字段