1. SELECT *
  2.   FROM (SELECT pubformdat0_.id                  id332_,
  3.                pubformdat0_.domain_id           domain2_332_,
  4.                pubformdat0_.process_id          process3_332_,
  5.                pubformdat0_.entity_id           entity4_332_,
  6.                pubformdat0_.file_type           file5_332_,
  7.                pubformdat0_.title               title332_,
  8.                pubformdat0_.word_no             word7_332_,
  9.                pubformdat0_.priority            priority332_,
  10.                pubformdat0_.secret_level        secret9_332_,
  11.                pubformdat0_.drafter             drafter332_,
  12.                pubformdat0_.drafter_name        drafter11_332_,
  13.                pubformdat0_.draft_dept          draft12_332_,
  14.                pubformdat0_.draft_deptname      draft13_332_,
  15.                pubformdat0_.draft_date          draft14_332_,
  16.                pubformdat0_.end_date            end15_332_,
  17.                pubformdat0_.arch_state          arch16_332_,
  18.                pubformdat0_.arch_fileid         arch17_332_,
  19.                pubformdat0_.gq_templateid       gq18_332_,
  20.                pubformdat0_.gw_templateid       gw19_332_,
  21.                pubformdat0_.edit_flag           edit20_332_,
  22.                pubformdat0_.delete_flag         delete21_332_,
  23.                pubformdat0_.operator            operator332_,
  24.                pubformdat0_.operate_date        operate23_332_,
  25.                pubformdat0_.file_security_level file24_332_,
  26.                pubformdat0_.yj_flag             yj25_332_,
  27.                pubformdat0_.yj_user             yj26_332_
  28.           FROM wf_pub_form_data pubformdat0_
  29.          WHERE 1 = 1
  30.            AND pubformdat0_.id IN
  31.                (SELECT DISTINCT pubformcas1_.form_id
  32.                   FROM wf_pub_form_case pubformcas1_
  33.                  WHERE pubformcas1_.case_id IN
  34.                        (SELECT to_char(caserun0_.id)
  35.                           FROM case_run caserun0_, workitem_run workitemru1_
  36.                          WHERE caserun0_.id = workitemru1_.caseid
  37.                            AND caserun0_.state = 2
  38.                            AND workitemru1_.performer IN ('300016/00415')
  39.                            AND workitemru1_.valid_flag = '0'
  40.                         UNION ALL
  41.                         SELECT to_char(caserun2_.id)
  42.                           FROM case_run         caserun2_,
  43.                                workitem_history workitemhi3_
  44.                          WHERE caserun2_.id = workitemhi3_.caseid
  45.                            AND caserun2_.state = 2
  46.                            AND workitemhi3_.performer IN ('300016/00415')
  47.                            AND workitemhi3_.valid_flag = '0'))
  48.          ORDER BY pubformdat0_.operate_date DESC)
  49.  WHERE rownum <= 10;
  50. PLAN_TABLE_OUTPUT
  51. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  52. Plan hash value: 1843931409
  53.  
  54. ------------------------------------------------------------------------------------------------------------------
  55. | Id  | Operation        | Name   | Rows  | Bytes |TempSpc| Cost (%CPU)| Time  |
  56. ------------------------------------------------------------------------------------------------------------------
  57. |   0 | SELECT STATEMENT       |    |    10 | 11200 |  |   230M  (1)|769:57:46 |
  58. |*  1 |  COUNT STOPKEY        |    |  |  |  |       |   |
  59. |   2 |   VIEW         |    |   718 |   785K|  |   230M  (1)|769:57:46 |
  60. |*  3 |    SORT ORDER BY STOPKEY      |    |   718 |   281K|   696K|   230M  (1)|769:57:46 |
  61. |   4 |     NESTED LOOPS       |    |   718 |   281K|  |   230M  (1)|769:57:45 |
  62. |   5 |      VIEW        | VW_NSO_1   |   714 | 35700 |  |   230M  (1)|769:57:28 |
  63. |   6 |       HASH UNIQUE       |    |   714 | 40698 |  |       |   |
  64. |*  7 |        FILTER        |    |  |  |  |       |   |
  65. |   8 |  TABLE ACCESS FULL      | WF_PUB_FORM_CASE  |   375K|    20M|  |  1817   (1)| 00:00:22 |
  66. |   9 |  UNION-ALL       |    |  |  |  |       |   |
  67. |  10 |   NESTED LOOPS       |    |     1 |    32 |  |   261   (0)| 00:00:04 |
  68. |  11 |    TABLE ACCESS BY INDEX ROWID| WORKITEM_RUN  |   132 |  3168 |  |   129   (0)| 00:00:02 |
  69. |* 12 |     INDEX RANGE SCAN      | IDX_WORKITEM_R_13 |   132 |  |  |     3   (0)| 00:00:01 |
  70. |* 13 |    TABLE ACCESS BY INDEX ROWID| CASE_RUN   |     1 |     8 |  |     1   (0)| 00:00:01 |
  71. |* 14 |     INDEX UNIQUE SCAN      | PK_CASE_RUN  |     1 |  |  |     0   (0)| 00:00:01 |
  72. |  15 |   NESTED LOOPS       |    |     1 |    31 |  |   368   (1)| 00:00:05 |
  73. |  16 |    TABLE ACCESS BY INDEX ROWID| WORKITEM_HISTORY  |   582 | 13386 |  |   226   (0)| 00:00:03 |
  74. |* 17 |     INDEX RANGE SCAN      | IDX_WORKITEM_H_13 |   325 |  |  |     5   (0)| 00:00:01 |
  75. |* 18 |    TABLE ACCESS BY INDEX ROWID| CASE_RUN   |     1 |     8 |  |     1   (0)| 00:00:01 |
  76. |* 19 |     INDEX UNIQUE SCAN      | PK_CASE_RUN  |     1 |  |  |     0   (0)| 00:00:01 |
  77. |  20 |      TABLE ACCESS BY INDEX ROWID     | WF_PUB_FORM_DATA  |     1 |   352 |  |     2   (0)| 00:00:01 |
  78. |* 21 |       INDEX UNIQUE SCAN       | SYS_C0051297  |     1 |  |  |     1   (0)| 00:00:01 |
  79. ------------------------------------------------------------------------------------------------------------------
  80.  
  81. Predicate Information (identified by operation id):
  82. ---------------------------------------------------
  83.  
  84.    1 - filter(ROWNUM<=10)
  85.    3 - filter(ROWNUM<=10)
  86.    7 - filter( EXISTS ( (SELECT /*+ */ TO_CHAR("CASERUN0_"."ID") FROM "WORKITEM_RUN"
  87.        "WORKITEMRU1_","CASE_RUN" "CASERUN0_" WHERE "CASERUN0_"."ID"="WORKITEMRU1_"."CASEID" AND
  88.        "CASERUN0_"."STATE"=2 AND TO_CHAR("CASERUN0_"."ID")=:B1 AND "WORKITEMRU1_"."VALID_FLAG"='0' AND
  89.        "WORKITEMRU1_"."PERFORMER"='300016/00415') UNION ALL  (SELECT /*+ */ TO_CHAR("CASERUN2_"."ID") FROM
  90.        "WORKITEM_HISTORY" "WORKITEMHI3_","CASE_RUN" "CASERUN2_" WHERE "CASERUN2_"."ID"="WORKITEMHI3_"."CASEID"
  91.        AND "CASERUN2_"."STATE"=2 AND TO_CHAR("CASERUN2_"."ID")=:B2 AND "WORKITEMHI3_"."VALID_FLAG"='0' AND
  92.        "WORKITEMHI3_"."PERFORMER"='300016/00415')))
  93.   12 - access("WORKITEMRU1_"."PERFORMER"='300016/00415' AND "WORKITEMRU1_"."VALID_FLAG"='0')
  94.   13 - filter("CASERUN0_"."STATE"=2)
  95.   14 - access("CASERUN0_"."ID"="WORKITEMRU1_"."CASEID")
  96.        filter(TO_CHAR("CASERUN0_"."ID")=:B1)
  97.   17 - access("WORKITEMHI3_"."PERFORMER"='300016/00415' AND "WORKITEMHI3_"."VALID_FLAG"='0')
  98.   18 - filter("CASERUN2_"."STATE"=2)
  99.   19 - access("CASERUN2_"."ID"="WORKITEMHI3_"."CASEID")
  100.        filter(TO_CHAR("CASERUN2_"."ID")=:B1)
  101.   21 - access("PUBFORMDAT0_"."ID"="$nso_col_1")
  102.  
  103. 50 rows selected.
  104.  
  105. 7 - filter( EXISTS ( (SELECT /*+ */ TO_CHAR("CASERUN0_"."ID") FROM "WORKITEM_RUN"
  106.        "WORKITEMRU1_","CASE_RUN" "CASERUN0_" WHERE "CASERUN0_"."ID"="WORKITEMRU1_"."CASEID" AND
  107.        "CASERUN0_"."STATE"=2 AND TO_CHAR("CASERUN0_"."ID")=:B1 AND "WORKITEMRU1_"."VALID_FLAG"='0' AND
  108.        "WORKITEMRU1_"."PERFORMER"='300016/00415') UNION ALL  (SELECT /*+ */ TO_CHAR("CASERUN2_"."ID") FROM
  109.        "WORKITEM_HISTORY" "WORKITEMHI3_","CASE_RUN" "CASERUN2_" WHERE "CASERUN2_"."ID"="WORKITEMHI3_"."CASEID"
  110.        AND "CASERUN2_"."STATE"=2 AND TO_CHAR("CASERUN2_"."ID")=:B2 AND "WORKITEMHI3_"."VALID_FLAG"='0' AND
  111.        "WORKITEMHI3_"."PERFORMER"='300016/00415')))
  112.  
  113.  pubformcas1_.case_id IN
  114.                        (SELECT to_char(caserun0_.id)
  115.                           FROM case_run caserun0_, workitem_run workitemru1_
  116.                          WHERE caserun0_.id = workitemru1_.caseid
  117.                            AND caserun0_.state = 2
  118.                            AND workitemru1_.performer IN ('300016/00415')
  119.                            AND workitemru1_.valid_flag = '0'
  120.                         UNION ALL
  121.                         SELECT to_char(caserun2_.id)
  122.                           FROM case_run         caserun2_,
  123.                                workitem_history workitemhi3_
  124.                          WHERE caserun2_.id = workitemhi3_.caseid
  125.                            AND caserun2_.state = 2
  126.                            AND workitemhi3_.performer IN ('300016/00415')
  127.                            AND workitemhi3_.valid_flag = '0'))
  128.  
  129. 这里子查询解嵌套没有展开,改写如下:
  130.   SELECT *
  131.     FROM (SELECT  pubformdat0_.id id332_, pubformdat0_.domain_id domain2_332_,
  132.                  pubformdat0_.process_id process3_332_,
  133.                  pubformdat0_.entity_id entity4_332_,
  134.                  pubformdat0_.file_type file5_332_,
  135.                  pubformdat0_.title title332_, pubformdat0_.word_no word7_332_,
  136.                  pubformdat0_.priority priority332_,
  137.                  pubformdat0_.secret_level secret9_332_,
  138.                  pubformdat0_.drafter drafter332_,
  139.                  pubformdat0_.drafter_name drafter11_332_,
  140.                  pubformdat0_.draft_dept draft12_332_,
  141.                  pubformdat0_.draft_deptname draft13_332_,
  142.                  pubformdat0_.draft_date draft14_332_,
  143.                  pubformdat0_.end_date end15_332_,
  144.                  pubformdat0_.arch_state arch16_332_,
  145.                  pubformdat0_.arch_fileid arch17_332_,
  146.                  pubformdat0_.gq_templateid gq18_332_,
  147.                  pubformdat0_.gw_templateid gw19_332_,
  148.                  pubformdat0_.edit_flag edit20_332_,
  149.                  pubformdat0_.delete_flag delete21_332_,
  150.                  pubformdat0_.operator operator332_,
  151.                  pubformdat0_.operate_date operate23_332_,
  152.                  pubformdat0_.file_security_level file24_332_,
  153.                  pubformdat0_.yj_flag yj25_332_, pubformdat0_.yj_user yj26_332_
  154.               FROM wf_pub_form_data pubformdat0_
  155.               WHERE 1 = 1
  156.                 AND pubformdat0_.id IN (SELECT  DISTINCT pubformcas1_.form_id
  157.                          FROM wf_pub_form_case pubformcas1_
  158.                         /* WHERE pubformcas1_.case_id IN */
  159.                         where exists
  160.                          -----------------------------------------------------------------------
  161.                         (select null from  (SELECT  to_char(caserun0_.id) as id
  162.                                                             FROM case_run caserun0_,
  163.                                                                  workitem_run workitemru1_
  164.                                                             WHERE caserun0_.id
  165.                                                                   =
  166.                                                                   workitemru1_.caseid
  167.                                                               AND caserun0_.state
  168.                                                                   = 2
  169.                                                               AND workitemru1_.performer
  170.                                                                   IN (
  171.                                                                    '300016/00415'
  172.                                                                    )
  173.                                                               AND workitemru1_.valid_flag
  174.                                                                   = '0'
  175.                                                         UNION ALL
  176.                                                         SELECT to_char(
  177.                                                                caserun2_.id)
  178.                                                             FROM case_run caserun2_,
  179.                                                                  workitem_history workitemhi3_
  180.                                                             WHERE caserun2_.id
  181.                                                                   =
  182.                                                                   workitemhi3_.caseid
  183.                                                               AND caserun2_.state
  184.                                                                   = 2
  185.                                                               AND workitemhi3_.performer
  186.                                                                   IN (
  187.                                                                    '300016/00415'
  188.                                                                    )
  189.                                                               AND workitemhi3_.valid_flag
  190.                                                                   = '0'
  191.                                                                   ) t
  192.  
  193.                                                      where    pubformcas1_.case_id =  t.id         )
  194.  
  195.                                                                   )
  196.               ORDER BY pubformdat0_.operate_date DESC)
  197.     WHERE rownum <= 10

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