Question

我正在编写一个查询来为员工提取转出。这意味着排在行之前的行＆＃39;转移＆＃39;。有些员工在同一天有转移操作和另一个操作。但是我的查询获取的日期是＆lt;转移行动日期。我想写一些像这样的东西： -

select * 
from per_all_assignments_m paam 
where paam.effective_start_date= 
      (case if (paam.effective_start_date=
                (select max(paam1.effective_start_date) 
                 from per_all_assignments_m paam1 
                 where paam1.person_id=paam.person_id and
                       paam.assignment_id=paam1.assignment_id and
                       paam1.action_code <> 'TRANSFER' and
                       paa1.effective_latest_change='N' )
                ) 
            then paam.effective_start_date    
            else (paam.effective_start_date=
                  (select max(paam1.effective_stat_date) 
                   from per_all_assignments_m paam1 
                   where paam.person_id=paam1.person_id and
                         paam.assignment_id=paam1.assignment_id and
                         paam1.effective_start_date < 
                         (select max(paam2.effective_start_date) 
                          from per_all_assignments_m paam2 
                          where paam2.action_code='TRANSFER' and
                                paam1.person_id = paam2.person_id and
                                paam1.assignment_id=paam2.assignment_id)
                  )
                 )
      )

是否可以在Oracle中使用？

Answer 1

是的，有可能

SELECT
  *
FROM
  per_all_assignments_m paam
WHERE
  paam.effective_start_date =
    (
      CASE
        WHEN
          paam.effective_start_date =
            (
              SELECT
                MAX(paam1.effective_start_date)
              FROM
                per_all_assignments_m paam1
              WHERE
                paam1.person_id = paam.person_id AND
                paam.assignment_id = paam1.assignment_id AND
                paam1.action_code <> 'TRANSFER' AND
                paa1.effective_latest_change = 'N'
            )
        THEN paam.effective_start_date
        ELSE
          (
            SELECT
              MAX(paam1.effective_stat_date)
            FROM
              per_all_assignments_m paam1
            WHERE
              paam.person_id = paam1.person_id AND
              paam.assignment_id = paam1.assignment_id AND
              paam1.effective_start_date <
              (
                SELECT
                  MAX(paam2.effective_start_date)
                FROM
                  per_all_assignments_m paam2
                WHERE
                  paam2.action_code = 'TRANSFER' AND
                  paam1.person_id = paam2.person_id AND
                  paam1.assignment_id = paam2.assignment_id
              )
          )
       END -- closing END for case when..
    )

Answer 2

在前一个选择请求

中

前一个应该有END）

Oracle SQL-如果在where子句内部写例

2 个答案: