Question

有人可以，就如何加入以下两个选择陈述给我一些建议：

SELECT TOP 200 * 
FROM dbo.Creation_LimitsAndExclusions WITH (nolock) 
WHERE LeagueCodeID = 37

和

select * 
from dbo.Creation_Markets with (nolock) 
where ClassID = 9 and IsParentMatch = 1

提前致谢。

Answer 1

我不知道密钥是什么，但如果密钥在两个表中都是CreationID，那么连接将如下所示：

SELECT TOP 200 * 
FROM dbo.Creation_LimitsAndExclusions WITH (nolock) 
LEFT JOIN dbo.Creation_Markets ON Creation_LimitsAndExclusions.CreationID = Creation_Markets.CreationID 
WHERE Creation_LimitsAndExclusions.LeagueCodeID = 37
  AND Creation_Markets.ClassID = 9 and Creation_Markets.IsParentMatch = 1

Answer 2

也不知道密钥是什么，但我会在where子句中添加cm.creationId IS NOT NULL条件，以确保我们不从Creation_LimitsAndExclusions中获取不匹配的行

SELECT TOP 200 * 
FROM dbo.Creation_LimitsAndExclusions cle WITH (nolock) 
LEFT JOIN dbo.Creation_Markets cm
    ON cle.CreationID = cm.CreationID 
WHERE cle.LeagueCodeID = 37
    AND cm.ClassID = 9 
    AND cm.IsParentMatch = 1
    AND cm.creationID IS NOT NULL

加入两个select语句

2 个答案: