SQL - 选择多重条件

Question

我想选择使用下面的查询条件乘法：

SELECT (SELECT count(*) 
     FROM users 
    ) 
     as totalusers, 
     (SELECT sum(cashedout) 
      FROM users 
     ) AS cashedout, 
     (SELECT COUNT(*) 
      FROM xeon_users_rented 
     ) AS totalbots, 
(SELECT sum(value) 
      FROM xeon_stats_clicks 
WHERE typ='3' OR typ='1' 
     ) AS totalclicks 

上面的查询只需要下一个第二（0.912确切）来执行。这会使成千上万的请求减慢很多。

什么似乎是合乎逻辑对我来说是这样的方法：

SELECT (SELECT count(*), sum(cashedout) 
     FROM users 
    ) 
     as totalusers, cashedout, 
     (SELECT COUNT(*) 
      FROM xeon_users_rented 
     ) AS totalbots, 
(SELECT sum(value) 
      FROM xeon_stats_clicks 
WHERE typ='3' OR typ='1' 
     ) AS totalclicks 

但是不工作，我得到了以下错误：

#1241 - Operand should contain 1 column(s) 

此外，我怎么能加入其他两个我的第一个查询中的表“xeon_users_rented”和“xeon_stats_clicks”？

Answer 1

这很慢，因为您有多个子查询。尝试使用连接代替。

此外，您的表格，列的列表将帮助我们更好地协助您。

Answer 2

你的第二个查询使用错误的语法，应该是

SELECT 
count(*) as totalusers, 
sum(cashedout) cashedout, 
(SELECT COUNT(*) FROM xeon_users_rented) AS totalbots, 
(SELECT sum(value) FROM xeon_stats_clicks 
WHERE typ='3' OR typ='1') AS totalclicks 
FROM users