如何对GROUP BY子句生成的COUNT(名称)执行WHERE？

Question

WHERE在SELECT语句中的GROUP BY之前被处理.如何在COUNT(名称)的结果上使用WHERE？

我想要的是这个:

SELECT topic, COUNT(name) AS counter
FROM blah
GROUP BY name
WHERE counter <> 1

Answer 1

SELECT topic, COUNT(name) AS counter
FROM blah
GROUP BY topic
HAVING COUNT(name) <> 1

Answer 2

我想你正在寻找有条款:

http://msdn.microsoft.com/en-us/library/ms180199.aspx

SELECT topic, COUNT(name) AS counter
FROM blah
GROUP BY topic
HAVING COUNT(name) <> 1