mysql - 每个派生表必须有自己的别名 mysql

Question

我有一个名为 Days 的临时表，创建为

  CREATE TEMPORARY TABLE days (start_date DATETIME)as
  SELECT DATE_ADD(begin_date, INTERVAL n - start_health_post_id DAY) as     
              start_date FROM NOF 
  ORDER BY n
  LIMIT nofdays;

现在我想要与一堆执行内部联接的选择语句进行交叉联接

所以，我尝试了这种方法

Select * from days
cross join
(
Select practices.*, providers.*, practice_locations.*
from practices
Inner Join providers on practices.health_post_id = providers.health_post_id
Inner join practice_locations on practices.health_post_id =practice_locations.health_post_id
);

但是它给出了一个错误，指出每个派生表必须有自己的别名。

请帮忙!

Answer 1

为子查询设置别名，例如:

Select * from days
cross join
(
Select practices.*, providers.*, practice_locations.*
from practices
Inner Join providers on practices.health_post_id = providers.health_post_id
Inner join practice_locations on practices.health_post_id =practice_locations.health_post_id
) t1;

我将 t1 设置为别名。