Laravel mysql如何在同一个查询中计算多个表的字段

Posted 2021-03-28

我有三个名为users的mysql表，'clients'和'products'。我想计算同一查询中每个表的'id'字段。可能吗？请帮我。提前致谢。

答案

请这个声明

SELECT u.total_users, c.total_clients, p.total_products (
 SELECT COUNT(id) as total_users FROM users
) as u,
(
  SELECT COUNT(id) as total_clients FROM clients
) as c,
(
   SELECT COUNT(id) as total_products FROM products
) as p