Question

如果我有一个包含列所有者，wallColor和roofColor的属性表（假设一个所有者可以拥有多个房屋，但房屋只能拥有一个所有者），我该如何选择所有只拥有相同墙的房屋的所有者屋顶颜色？

所以，如果我有

owner   wallColor  roofColor
Bob     Red        Green
Bob     Blue       Blue
Greg    Yellow     Yellow
Greg    Black      Black

它应该只返回格雷格，因为鲍勃有一座红墙和绿屋顶的房子。

Answer 1

SELECT DISTINCT owner 
FROM ytable 
WHERE owner NOT IN 
(
    SELECT owner 
    FROM ytable 
    WHERE wallColor <> roofColor
)

Answer 2

 SELECT DISTINCT t1.owner
 FROM tablename t1
 WHERE t1.owner NOT IN
 (
    SELECT DISTINCT t2.owner FROM tablename t2
    WHERE t2.wallColor != t2.roofColor
 )

Answer 3

SELECT DISTINCT OWNER FROM ... WHERE wallcolor = roofcolor 除了 SELECT [DISTINCT] OWNER FROM ... WHERE wallcolor＆lt;＆gt; roofcolor;

： - ）

Answer 4

SELECT DISTINCT owner FROM table WHERE wallColor=roofColor AND 
owner NOT IN ( SELECT DISTINCT owner FROM table WHERE wallColor<>roofColor )

那将是我的方法，但可能需要一些调整。

Answer 5

使用exists运算符：

select *
from table t
where not exists(
    select 1
    from table t1
    where t1.owner = t.owner and t1.wallColor <> t1.roofColor
)

SQL select id其他列相同的位置

5 个答案: