如何从子查询中只获取一行？

Question

我有 6 列的查询，并且我想获取其他表列的总和。

我希望子查询的结果在一行中，但它重复了。

select t.id, t.subject, t.created_at, u.name, l.name as l_name, 
ty.name as t_name
,(select sum(new) from statuses ) as new
,(select sum(open) from statuses) as open
,(select sum(close) from statuses) as close
,(select sum(`delete`) from statuses) as `delete`
 from tickets t 
 left join users u  on u.id=t.user_id
 left join levels l on l.id=t.level_id
 left join types ty on ty.id=t.type_id

你能帮帮我吗？

Answer 1

你可以在里面使用GROUP BY，

select t.id, t.subject, t.created_at, u.name, l.name as l_name, 
ty.name as t_name
,(select sum(new) from statuses ) as new
,(select sum(open) from statuses) as open
,(select sum(close) from statuses) as close
,(select sum(`delete`) from statuses) as `delete`
 from tickets t 
 left join users u  on u.id=t.user_id
 left join levels l on l.id=t.level_id
 left join types ty on ty.id=t.type_id GROUP BY u.name;