Mysql在單個查詢中統計兩行

Question

是否可以在單個查詢中統計兩行？現在，我使用兩個查詢：

SELECT count(draft) AS draftCount FROM projects WHERE draft = 1 AND user_id = ? 

而另一個問題：

SELECT count(published) AS publishedCount FROM projects WHERE published = 1 AND user_id = ? 

我想這兩個查詢合併成一個這可能嗎？

Answer 1

SELECT SUM(published) AS publishedCount, 
     SUM(draft) AS draftCount 
FROM projects 
WHERE user_id = ? 

據我瞭解您的查詢的published和draft值是1真正和0假。所以你可以只需SUM他們得到相同的結果。

Answer 2

試試這個

SELECT count(case when draft = 1 then draft end) AS draftCount, 
count(case when published = 1 then published end) AS publishedCount 
FROM projects 
WHERE user_id = ? 

Answer 3

嘗試UNION：

(SELECT count(draft) FROM projects WHERE draft = 1 AND user_id = 4) 
UNION 
(SELECT count(published) FROM projects WHERE published = 1 AND user_id = 4);