Store the query results

Question

Hi,
I have a sub-query,which occurs 8 times inside 8 different case conditions .Is there any way that i can execute it once and store the results for further use,,, so that next time i directly get the results of the query without having to parse it and execute it..I think this would improve the performance
The subquery is
WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset))Any suggestions ,help from all you masters.. i would be grateful

Answer 1

Here is the complete query
SELECT (CASE
           WHEN (NVL (mi.host_deal_nb, ' ') = ' ')
              THEN (SELECT host_deal_nb
                      FROM mif
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mi.host_deal_nb
        END
       ) hub_deal_no,
       (CASE
           WHEN (SUBSTR (NVL (mt.free_text2, 'XX,XXX'), 1, 2) = 'XX')
              THEN (SELECT SUBSTR (free_text2, 1, 2)
                      FROM mtf1000
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE SUBSTR (mt.free_text2, 1, 2)
        END
       ) system_code,
       (CASE
           WHEN (SUBSTR (NVL (mt.free_text2, 'XX,XXX'), 4, 3) = 'XXX')
              THEN (SELECT SUBSTR (free_text2, 4, 3)
                      FROM mtf1000
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE SUBSTR (mt.free_text2, 4, 3)
        END
       ) deal_code,
       CASE
          WHEN mi.mop = 'BOOK'
             THEN CASE
                    WHEN mt.db_acc_off = 'PH1'
                       THEN 'T'
                    ELSE 'TT'
                 END
          WHEN mi.mop = 'SWIFT'
             THEN 'TT'
          WHEN mi.mop = 'INTERO'
             THEN 'TT'
          WHEN mi.mop LIKE 'DRFT%'
             THEN 'DD'
          WHEN mi.mop LIKE 'CHEQ%'
             THEN 'CO'
          ELSE 'LP'
       END payment_method,
       mi.mid,
       DECODE (mi.orig_mop,
               'SWIFT', 'SWF',
               'INTRERO', 'GPS',
               'FEEDER', 'EBS',
               'LPS'
              ) iw_trns_type,
       DECODE (mi.orig_mt, NULL, mi.msg_type, mi.orig_mt) msg_type,
       DECODE (mi.orig_reference,
               NULL, mi.REFERENCE,
               mi.orig_reference
              ) REFERENCE,
       DECODE (mt.orig_rfb, NULL, mt.rfb, mt.orig_rfb) related_ref,
       mi.value_date, mi.origvaluedate,
       (CASE
           WHEN mt.acc_no IS NULL
              THEN (SELECT acc_no
                      FROM mtf1000
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mt.acc_no
        END
       ) debit_hub_acc_no,
       (CASE
           WHEN mt.acc_type IS NULL
              THEN (SELECT acc_type
                      FROM mtf1000
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mt.acc_type
        END
       ) debit_hub_acc_type,
       (CASE
           WHEN mi.dbcurrency IS NULL
              THEN (SELECT mi.dbcurrency
                      FROM mif
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mi.dbcurrency
        END
       ) debit_hub_acc_currency,
       (CASE
           WHEN mt.cr_acc_no IS NULL
              THEN (SELECT mt.cr_acc_no
                      FROM mif
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mt.cr_acc_no
        END
       ) credit_hub_acc_no,
       (CASE
           WHEN mt.cr_acc_type IS NULL
              THEN (SELECT mt.cr_acc_type
                      FROM mtf1000
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mt.cr_acc_type
        END
       ) credit_hub_acc_type,
       (CASE
           WHEN mi.crcurrency IS NULL
              THEN (SELECT mi.crcurrency
                      FROM mif
                     WHERE mid =
                              (SELECT childmid
                                 FROM mfamily
                                WHERE relation = 'FUNDCREDIT'
                                  AND parentmid IN (
                                         SELECT mid
                                           FROM batch_subset
                                          WHERE pk_batch_subset =
                                                            mi.pk_batch_subset)))
           ELSE mi.crcurrency
        END
       ) credit_hub_acc_currency,
       mi.cramount, mi.orig_currency, mi.orig_amount,
       (CASE
           WHEN (mt.fx_deal_tp = 'X')
              THEN mi.dbamount * mt.dr_side_rate_am
           ELSE (CASE
                    WHEN (mi.crcurrency <> mi.currency)
                       THEN mi.dbamount
                    ELSE (CASE
                             WHEN (mi.currency = mi.dbcurrency)
                                THEN (mi.dbamount * mt.cr_rate)
                             WHEN (mi.currency = mi.crcurrency)
                                THEN (mi.dbamount * mt.dr_rate)
                          END
                 END
        END
       ) rmt_amt_in_lcl_ccy_eqv,
       CASE
          WHEN mt.fx_deal_tp = 'X'
             THEN mt.dr_side_rate_am
          WHEN mi.crcurrency != 'PHP'
             THEN 1
          WHEN mi.currency = mi.dbcurrency
             THEN mt.cr_rate
          WHEN mi.currency = mi.crcurrency
             THEN mt.dr_rate
       END exchange_rate,
       (CASE
           WHEN mt.fx_deal_tp = 'X'
              THEN mt.cr_side_rate_am
        END) cross_rate, DECODE (mt.org_idcode, 'AC', mt.org_id, '') org_id,
       mt.org_bic, mt.org, mt.org_addr1, mt.org_addr2, mt.org_addr3,
       DECODE (mt.bnf_idcode, 'AC', mt.bnf_id, '') bnf_id, mt.bnf_bic, mt.bnf,
       mt.bnf_addr1, mt.bnf_addr2, mt.bnf_addr3, mt.obi, mt.charges,
       (SELECT CONTENTS
          FROM messagefreetext mr
         WHERE UPPER (fieldname) = 'Narrative_77B'
           AND mr.mid = mi.mid
           AND ROWNUM = 1) CONTENTS,
       mi.orig_sender, mi.service, mi.mop, mi.batch_msg_tp,
       mi.batch_payment_tp, mi.msg_class,
       (CASE
           WHEN (mt.fx_deal_tp = 'X')
              THEN mt.cr_side_rate_am
           ELSE mt.cr_rate
        END
       ) cr_amt_in_lcl_ccy,
       (CASE
           WHEN (mt.fx_deal_tp = 'X')
              THEN mt.cr_side_rate_am
           ELSE mt.cr_rate
        END
       ) exrate_cr_amt_lcl_ccy,
       (CASE
           WHEN (mi.non_stp = '1')
              THEN 'Y'
           ELSE 'N'
        END) non_stp_indicator
  FROM (SELECT mid
          FROM mif ssmi
         WHERE NVL (ssmi.pk_batch_subset, 999999) IN (
                  SELECT NVL (smi.pk_batch_subset, 0)
                    FROM mtf1000 smt, mif smi
                   WHERE smt.free_text2 IN ('AF,IDP', 'AF,XFR', 'AF,TFR')
                     AND smi.posting_status = 'SUCCESSFUL'
                     AND smt.mid = smi.mid)
           AND ssmi.batch_msg_tp = 'I'
        UNION
        SELECT ssmt.mid
          FROM mtf1000 ssmt, mif smmt
         WHERE ssmt.free_text2 IN
                  ('HE,TFR',
                   'IR,TTI',
                   'IR,TTB',
                   'IR,CO',
                   'IR,DD',
                   'IR,ITO',
                   'IR,IRT'
           AND ssmt.mid = smmt.mid
           AND smmt.posting_status = 'SUCCESSFUL') ts1,
       mif mi,
       mtf1000 mt
WHERE mi.posting_status = 'SUCCESSFUL'
   AND mi.msg_status = 'COMPLETE'
   AND NVL (mi.batch_payment_tp, ' ') NOT IN ('RTACH', 'ACHRT', 'DRO', 'DRI')
   AND mi.process_dt = TO_DATE ('20061222', 'YYYYMMDD')
   AND mi.office = 'PH1'
   AND ts1.mid = mi.mid
   AND mi.mid = mt.mid
   AND ((SELECT (CASE
                    WHEN (mif.complete_time >= memopost.update_date)
                       THEN (mif.complete_time)
                    ELSE (memopost.update_date)
                 END
           FROM mif, memopost
          WHERE mif.mid = mi.mid AND mif.mid = memopost.mid AND ROWNUM = 1) >
                      TO_DATE ('2008/02/05 10:12:24', 'YYYY/MM/DD HH24:MI:SS')
   AND ((SELECT (CASE
                    WHEN (mif.complete_time >= memopost.update_date)
                       THEN (mif.complete_time)
                    ELSE (memopost.update_date)
                 END
           FROM mif, memopost
          WHERE mif.mid = mi.mid AND mif.mid = memopost.mid AND ROWNUM = 1) <=
                      TO_DATE ('2008/03/06 20:00:00', 'YYYY/MM/DD HH24:MI:SS')
       )