计数记录没有计数功能

Question

人类表：

ID  Name
1   Peter
2   Peter
3   Peter
4   Tom
5   Tom
6   Mary
7   Paul

如果我想在人类表中选择一个包含3次或更多次的名称，我可以这样编写查询：

Select name, count(name)
From Human
Group By name
Having count(name) >= 3

但我现在需要编写一个没有和count函数的查询。那么，如何实现这个查询？

Answer 1

不是GROUP BY，没有HAVING，没有COUNT - 而是双重自我join。没有多大意义，但它确实有效！

select distinct t1.name
from tablename t1
join tablename t2 on t1.name = t2.name and t1.id <> t2.id
join tablename t3 on t1.name = t3.name and t1.id <> t3.id and t2.id <> t3.id 

顺便说一句，告诉你老师你在互联网上找到了这个解决方案......

在这里演示：

SQLFiddle

Answer 2

WITH cte
AS (
    SELECT NAME
        ,SUM(1) AS NameCount
    FROM Human
    GROUP BY NAME
    )
SELECT *
FROM cte
WHERE NameCount >= 3

或

SELECT *
FROM (
    SELECT NAME
        ,SUM(1) AS NameCount
    FROM Human
    GROUP BY NAME
    ) MyTable
WHERE NameCount >= 3