斷點

SELECT b.c_dpt_cde      as CDptCde,
       a.c_prod_no      as CProdNo,
       a.c_ply_no       as CPlyNo,
       a.c_edr_no       as CEdrNo,
       a.c_insrnt_cde   as CInsrntCde,
       a.c_bs_cur       as CBsCur,
       a.n_bs_amt       as NBsAmt,
       a.n_exch_rate    as NExchRate,
       a.c_rp_cur       as CRpCur,
       a.n_rp_amt       as NRpAmt,
       a.n_orig_cur_amt as NOrigCurAmt,
       a.c_main_con_cde as CMainConCde,
       a.c_sls_cde      as CSlsCde,
       a.c_cha_cls      as CChaCls,
       a.c_cha_cde      as CChaCde,
       b.c_oper_cde     as COperCde,
       b.t_cav_tm       as TCavTm,
       b.t_upd_tm       as TUpdTm,
       a.c_cav_pk_id    as CCavPkId,
       c.c_rp_type      as CRpType,
       b.c_check_cde    as CCheckCde,
       b.t_check_tm     as TCheckTm,
       b.c_check_flag   as CCheckFlag,
       b.c_check_memo   as CCheckMemo,
       a.c_prmdue_pk_id as CPrmduePkId,
       a.c_paydue_pk_id as CPayduePkId,
       a.c_clmdue_pk_id as CClmduePkId,
       a.c_cavdoc_pk_id as CCavdocPkId,
       a.c_clm_no       as CClmNo,
       a.c_bill_flag    as CBillFlag,
       a.c_feetyp_cde   as CFeetypCde
  FROM web_fin_cav_doc a
  left join web_fin_cav_bill b on a.c_cav_pk_id = b.c_cav_pk_id
  left join web_fin_cav_rptyp c on a.c_cav_pk_id = c.c_cav_pk_id
 WHERE 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1
   AND 1 = 1;

上面實現(xiàn)的是三個數(shù)據(jù)表之間的左連接。以前看見過兩個表的左連接，而要實現(xiàn)三個表之間的左連接，還真有點困難，搞了半天才做出來。。。