Question

所以我有2个数据表，一个名为OCEAN，列为：TYPE1和COLOR1 另一个名为LAKE的列为：TYPE2和COLOR2 我试图弄清楚如何输出OCEAN表中的类型在OCEAN表中的类型比LAKE表更多。

现在我有：

    SELECT type1 from
    (SELECT type1, count(type1) as count1 from OCEAN 
    GROUP BY type1
    HAVING count1 > count2 from 
    (SELECT type2, count(type2) as count2 from LAKE GROUP BY type2)
    )

但显然不起作用。有什么想法吗？

Answer 1

我认为这是一个解决方案：

select type1
from ocean 
group by type1
having count(type1) > (
    select count(type2) from lake where type2=type1 group by type2)

您可以使用this online demo

Answer 2

您可以使用OUTER APPLY ..

执行此操作

SELECT  Type1,
        COUNT(*) Type1Count,
        Type2Count
FROM    Ocean o
        OUTER APPLY (SELECT COUNT(*) Type2Count
                     FROM   Lake l
                     WHERE  l.Type2 = o.Type1
                    ) oa
GROUP BY Type1,
        Type2Count
HAVING  COUNT(*) > Type2Count

SQL：如何比较来自2个不同表的计数但输出最大值

2 个答案: