一个复杂关联的sql

在项目中遇到了一个比较复杂关系的sql,关联关系有些模糊，现在梳理一下

sql如下：

SELECT TRAN.TRANS_DATE,
       TRAN.TRANS_TIME,
       TRAN.BUSI_TRAC_CODE YW,
       PZK.JSPZK_PZBH PZBH,
       DECODE(PZK.JSPZK_PZRQ,
              '',
              DECODE(KMZD.F_YEFX,
                     1,
                     RYE.JSZHRYEB_QCYE,
                     2,
                     RYE.JSZHRYEB_QCYE * (-1),
                     0),
              DECODE(KMZD.F_YEFX,
                     1,
                     YE.JSZHYEB_QCYE,
                     2,
                     YE.JSZHYEB_QCYE * (-1),
                     0)) QCYE,
       DECODE(PZFL.JSPZFL_JZFX, '', PZFL.JSPZFL_JE, null) JFFS,
       DECODE(PZFL.JSPZFL_JZFX, '', PZFL.JSPZFL_JE, null) DFFS,
       TRAN.AMOUNT,
       DECODE(KMZD.F_YEFX,
              2,
              PZFL.JSPZFL_BAL * (-1) +
              NVL(PZFL.JSPZFL_FUNDSPOOL_BAL, 0) * (-1),
              PZFL.JSPZFL_BAL + NVL(PZFL.JSPZFL_FUNDSPOOL_BAL, 0)) ZHDQYE　,
       DECODE(PZFL.JSPZFL_OPP_NAME,
              NULL,
              TRAN.OPP_CUST_ACC_NAME,
              PZFL.JSPZFL_OPP_NAME) OPPNAME　,
       DECODE(PZFL.JSPZFL_OPP_ACTNO,
              NULL,
              TRAN.OPP_CUST_ACC_CODE,
              PZFL.JSPZFL_OPP_ACTNO) OPPACTNO,
       PZK.JSPZK_BZ ZY
  FROM JSPZFL PZFL, TRAN_FLOW TRAN, LSKMZD KMZD, JSPZK PZK
  left join JSZHYEB YE
    on YE.JSZHYEB_BH = ''
   AND YE.JSZHYEB_RQ = PZK.JSPZK_PZRQ
  left join JSZHRYEB RYE
    on RYE.JSZHRYEB_BH = ''
 WHERE PZK.JSPZK_PZNM = PZFL.JSPZFL_PZNM
   AND TRAN.VOUCHER_ID = PZK.JSPZK_PZNM
   AND TRAN.BUSI_TRAC_CODE NOT IN ('IFP_ZJXB', 'IFP_ZJSH')
   AND PZFL.JSPZFL_KMBH = KMZD.F_KMBH
   AND PZK.JSPZK_JZBZ <> ''
   AND NVL(PZFL.JSPZFL_BY7, '') != ''
   AND TRAN.CUST_CODE IN (select cust_code
                            from CUST_CORP_INFO
                           start with cust_code = ''
                          connect by prior organ_id = parent_code
                                 AND CUST_TYPE = '')

   AND EXISTS (SELECT 1
          FROM V_DIC_ACC ACC
         WHERE ACC.BH = PZFL.JSPZFL_ZHBH
           AND ACC.BH = '')

   AND PZK.JSPZK_PZRQ >= ''
   AND PZK.JSPZK_PZRQ <= ''
 ORDER BY PZK.JSPZK_PZNM, PZFL.JSPZFL_FLNM, TRAN.TRAC_ID