Question

我想使用以下查询选择乘法条件：

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

上面的查询需要不到一秒钟（准确地说是0.912）才能执行。数以千计的请求会减慢很多事情。

对我来说，合乎逻辑的是这种方法：

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

然而，这不起作用，因为我收到以下错误：

 #1241 - Operand should contain 1 column(s)

此外，如何在我的第一个查询中加入另外两个表“xeon_users_rented”和“xeon_stats_clicks”？

Answer 1

因为您有多个子查询，所以速度很慢。请尝试使用联接。

此外，您的表格，列列表可以帮助我们更好地为您提供帮助。

Answer 2

您的第二个查询使用了错误的语法，它应该是

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

SQL - 选择乘法条件

2 个答案: