SQL-IF陈述围绕AND

Question

我正在尝试创建一个查询，它只会在符合某些条件的地方添加AND子句。

这就是我所追求的：

SELECT DISTINCT 
    id 
    name 
    active 
FROM team 
WHERE id = 1234 
IF team.active = 'y' 
    AND team.id IN 
    { 
     query 
    } 
ELSEIF team.active = 'n' 
    AND team.id IN 
    { 
     query 
    } 

但我不知道如何在SQL做到这一点。有什么建议么？

Answer 1

SELECT DISTINCT 
    id 
    name 
    active 
    FROM team 
WHERE id = 1234 
    AND (team.active = 'y' 
    AND team.id IN 
     { 
      query 
     }) 
    OR 
    (team.active = 'n' 
    AND team.id IN 
     { 
     query 
     }) 

您使用AND和OR连接符来创建逻辑。

Answer 2

您可以使用布尔逻辑，像这样

SELECT ... 
FROM team 
WHERE id = 1234 
    AND (
     (team.active = 'y' AND team.id IN query) 
     OR 
     (team.active = 'n' AND team.id IN query) 
    ) 

我错过了在这两个分支的区别？

Answer 3

可以使用解码语句实现的结果

SELECT DISTINCT 
    id 
    name 
    active 
FROM team 
WHERE id = 1234 and 
team.id in (
decode (team.active,'y',(query),'n',(query)) 

你也可以使用情况statment