Question

下面是2个表中的示例记录

人员表

Per_Id      +     Per_type   
--------------------------------------------
000001            SINGULAR
000002            COLLECTIVE
000003            INSTITUTION
000004            INSTITUTION
000005            SINGULAR

人员字符表

Per_Id      +     Char_Type        +    Char_Val
-------------------------------------------------------------------------------
000002            STAT_TY               SUSPENSION
000002            STAT                  COMPLETE

000003            STAT_TY               SUSPENSION
000003            STAT                  COMPLETE

000004            STAT_TY               CESSATION
000004            STAT                  COMPLETE

000005            STAT_TY               DEATH
000005            STAT                  PENDING

要求是我需要选择具有以下条件的人员

在“人员字符表”中没有任何条目的人（可以正常工作）
在char表中具有条目但char STAT的值不是COMPLETE（工作正常）的人
具有值SUSPENSION的char的INSTITUTION类型的人

在上表中，查询返回的人员ID是

000001 (No record in char table)
000005 (The value of STAT char is not COMPLETE)
000003 (Institution person and char value is SUSPENSION)

下面是查询，在该查询中我需要帮助子句来选择满足第3点的记录。

SELECT P.PER_ID,
C.CHAR_VAL, C1.CHAR_VAL
FROM PERSON_TBL P
LEFT OUTER JOIN CHAR_TBL C ON C.PER_ID = P.PER_ID AND C.CHAR_TYPE = 'STAT_TY'
LEFT OUTER JOIN CHAR_TBL C1 ON C1.PER_ID = P.PER_ID AND C1.CHAR_TYPE = 'STAT'
WHERE
1=1
AND NVL(C.CHAR_VAL,' ')  NOT IN ('CESSATION','DEATH')
AND NVL(STCS.SRCH_CHAR_VAL,' ')  NOT IN ('COMPLETE')
AND ***need clause for selecting person of type SINGULAR and with char SUSPENSION***

Answer 1

exists和not exists怎么样：

select p.*
from person_tbl p
where not exists (select 1
                  from person_char pc
                  where pc.per_id = p.per_id
                 ) or
      exists (select 1
              from person_char pc
              where pc.per_id = p.per_id and
                    pc.char_type = 'STAT' and
                    pc.char_value <> 'COMPLETE'
            ) or
      (p.per_type = 'INSTITUTION' and
       exists (select 1
               from person_char pc
               where pc.per_id = p.per_id and
                     pc.char_type = 'STAT_TY' and
                     pc.char_value = 'SUSPENSION'
             )
      );

根据列上的不同条件选择记录

1 个答案: