SQL SHOW系列（五）

Use RANK() OVER kick out the lower bo_engineer_id, get the toppest.

CREATE OR REPLACE VIEW V_ENG_PROCCESS AS
SELECT *
  FROM (SELECT C.*,
               RANK() OVER(PARTITION BY C.BO_ENGINEERING_ID ORDER BY C.PROJECT_STATE DESC) LEV
          FROM (SELECT DISTINCT X.BO_ENGINEERING_ID, X.PROJECT_STATE
                  FROM (SELECT T1.*,
                               DECODE(T4.TASKID,
                                      NULL,
                                      DECODE(T3.TASKID,
                                             NULL,
                                             DECODE(T2.TASKID,
                                                    NULL,
                                                    DECODE(T5.TASKID,
                                                           NULL,
                                                           '',
                                                           '5'),
                                                    '6'),
                                             '7'),
                                      '8') PROJECT_STATE

                          FROM BO_ENG_TASK T1,
                               (SELECT T.*
                                  FROM BO_PHASE_TASK T
                                 WHERE T.TASKCODE = 'CBYSSQ'
                                   AND T.PHASE_TASK_STATE = '3') T2,
                               (SELECT T.*
                                  FROM BO_PHASE_TASK T
                                 WHERE T.TASKCODE = 'GCCBYSHYJY'
                                   AND T.PHASE_TASK_STATE = '3') T3,
                               (SELECT T.*
                                  FROM BO_PHASE_TASK T
                                 WHERE T.TASKCODE = 'GCJGPF'
                                   AND T.PHASE_TASK_STATE = '3') T4,
                               (SELECT T.*
                                  FROM BO_PHASE_TASK T
                                 WHERE T.TASKCODE = 'CBYSSQ'
                                   AND T.PHASE_TASK_STATE != '3') T5
                         WHERE T1.TASKID = T2.TASKID(+)
                           AND T1.TASKID = T3.TASKID(+)
                           AND T1.TASKID = T4.TASKID(+)
                           AND T1.TASKID = T5.TASKID(+)
                         ORDER BY PROJECT_STATE DESC) X
                 WHERE PROJECT_STATE IS NOT NULL) C) XX
 WHERE XX.LEV = 1
/**
 * 在建工程列表、工程台账中‘工程阶段’的数据源
 * 阶段代码：在建 5 待初验 6 待竣工 7  已竣工 8
 * @Add by Zhou Danyong 2010-11-25
 */;