从子查询中选择值而不重复sql

Question

我有表，其中类型A有两个值，类型B有两个值

A    |   B
-----|--------
val1 | val1
val2 | val2

我做子查询，但我得到了dubolicate值，看起来像这样

A    |   B
-----|--------
val1 | val1
val1 | val2
val2 | val1
val2 | val2

我的查询：

SELECT A, B
FROM 
(SELECT DISTINCT title as A
FROM TABLE1 
INNER JOIN TABLE2 ON TABLE1_TABLE2_ID = TABLE2_ID
INNER JOIN TABLE3 ON TABLE1_TABLE3_ID = TABLE3_ID
WHERE TABLE_TABLE3_ID = 2008 AND TABLE_TYP LIKE 'A' AND TABLE1_AKTIV = 'Y')
LEFT JOIN
(SELECT DISTINCT title as B
FROM TABLE1 
INNER JOIN TABLE2 ON TABLE1_TABLE2_ID = TABLE2_ID
INNER JOIN TABLE3 ON TABLE1_TABLE3_ID = TABLE3_ID
WHERE TABLE_TABLE3_ID = 2008 AND TABLE_TYP LIKE 'B' AND TABLE1_AKTIV = 'Y')
ON 1 = 1

你有什么想法我怎么能做到没有重复？

Answer 1

问题是ON 1=1。这将为您提供所有组合。您需要使用适当的参考列更改查询，例如ON A.id=B.id。