是否可以在单个查询中计数两行?现在我正在使用两个查询:
SELECT count(draft) AS draftCount FROM projects WHERE draft = 1 AND user_id = ?
和另一个:
SELECT count(published) AS publishedCount FROM projects WHERE published = 1 AND user_id = ?
我想把这两个查询合并成一个,是可能的吗?
SELECT SUM(published) AS publishedCount,
SUM(draft) AS draftCount
FROM projects
WHERE user_id = ?
据我了解,您的查询中published
和draft
的值为true, 1
为true, 0
为false。所以你可以只SUM
他们得到相同的结果。
试试这个
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 = ?
Try 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);