SQL查询其中count> = 3

Question

我是新来的SQL，并试图执行一个查询，只会返回每个类别，如果每个出现4次或更多。从谷歌搜索，似乎我应该使用计数，但它似乎并没有返回类别。

任何想法？

SELECT Category 
FROM myTable 
HAVING COUNT(*) >= 3"; 

Answer 1

这是将返回每个类别，如果每个出现4次或更多的查询。

SELECT Category 
FROM mytable 
GROUP BY Category 
HAVING count(*) >= 4; 

Answer 2

只需修改您的查询像这样通过添加GROUP BY子句：与

SELECT Category 
FROM myTable 
group by category 
HAVING COUNT(*) >= 4; -- Change this to 4 to return each Category if each one appears 4 times or more 

Answer 3

的HAVING条款只适用于结合GROUP BY

SELECT Category 
FROM myTable 
GROUP BY CATEGORY 
HAVING COUNT(*) > 3; 

根据您的文章也改变了你的HAVING想知道4个或更多。