SQL查詢其中count> = 3

Question

我是新來的SQL，並試圖執行一個查詢，只會返回每個類別，如果每個出現4次或更多。從谷歌搜索，似乎我應該使用計數，但它似乎並沒有返回類別。

任何想法？

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

Answer 1

這是將返回每個類別，如果每個出現4次或更多的查詢。

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

Answer 2

只需修改您的查詢像這樣通過添加GROUP BY子句：與

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條款只適用於結合GROUP BY

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

根據您的文章也改變了你的HAVING想知道4個或更多。