查询从同一个表的另外两列的检查条件中获取结果

Question

我有一张下表：

RuleID |  Code    |    Value
654     Branch          54
654     MessageType     MT103
654     Currency        USD
654     SourceSys       xyz
<!--Comment-Another set of RuleID data-->
656     Branch          54
656     MessageType     MT102
656     Currency        INR
--------So ON -------------
<!--Comment-Another set of RuleID data-->
658     Branch          54
658     MessageType     MT103
658     Currency        INR

每个 RuleID 最多可以有 5 到 6 个代码和它们的值。它可能有 1 也可能有 2。例如，这里我给出了 2 个设置值。一个用于规则 id 654 和其他 656。

现在需要一个查询，我可以在其中获取 Branch = 54 和 MessageType=MT102 的所有 RuleID

我在下面尝试过：-（但这显然行不通）

select RuleID 
from MyTable 
where (CODE='Branch' and Value='54') 
 and  (CODE='MessageType' and Value='MT102') 

也阅读联盟，但这在这里也行不通。

认为加入应该在这里做，但没有得到结果。

预期结果：我想查询 Branch 为 54 且 MessageType 为 MT103 的所有 RuleID。所以预期结果是 Ruleid-654,658

Answer 1

使用OR。

SELECT RuleID 
FROM MyTable 
WHERE (CODE = 'Branch' AND Value = '54') 
OR (CODE = 'MessageType' AND Value = 'MT102') 

Answer 2

大概是这样的吧？

SQL> WITH test (ruleid, code, VALUE)
  2       AS (SELECT 654, 'Branch', '54' FROM DUAL
  3           UNION
  4           SELECT 654, 'MessageType', 'MT103' FROM DUAL
  5           UNION
  6           SELECT 654, 'Currency', 'USD' FROM DUAL
  7           UNION
  8           SELECT 654, 'SourceSys', 'xyz' FROM DUAL
  9           UNION
 10           --
 11           SELECT 656, 'Branch', '54' FROM DUAL
 12           UNION
 13           SELECT 656, 'MessageType', 'MT102' FROM DUAL
 14           UNION
 15           SELECT 656, 'Currency', 'INR' FROM DUAL)
 16    SELECT ruleid
 17      FROM test
 18     WHERE (   (    code = 'Branch'
 19                AND VALUE = '54')
 20            OR (    code = 'MessageType'
 21                AND VALUE = 'MT102'))
 22  GROUP BY ruleid
 23    HAVING COUNT (*) = 2;

    RULEID
----------
       656

SQL>

Answer 3

你可以使用交集

WITH MyTable as 
(
  SELECT 654 RuleId, 'Branch' code, '54' value FROM DUAL
  UNION
  SELECT 654, 'MessageType', 'MT103' FROM DUAL
  UNION
  SELECT 654, 'Currency', 'USD' FROM DUAL
  UNION
  SELECT 654, 'SourceSys', 'xyz' FROM DUAL
  UNION
  SELECT 656, 'Branch', '54' FROM DUAL
  UNION
  SELECT 656, 'MessageType', 'MT102' FROM DUAL
  UNION
  SELECT 656, 'Currency', 'INR' FROM DUAL
)
select RuleID 
from   MyTable 
where  CODE='Branch' 
and    Value='54'
intersect
select RuleID 
from   MyTable 
where  CODE='MessageType' 
and    Value='MT102'