SQL - 選擇多重條件

Question

我想選擇使用下面的查詢條件乘法：

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 

上面的查詢只需要下一個第二（0.912確切）來執行。這會使成千上萬的請求減慢很多。

什麼似乎是合乎邏輯對我來說是這樣的方法：

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，我得到了以下錯誤：

#1241 - Operand should contain 1 column(s) 

此外，我怎麼能加入其他兩個我的第一個查詢中的表「xeon_users_rented」和「xeon_stats_clicks」？

Answer 1

這很慢，因爲您有多個子查詢。嘗試使用連接代替。

此外，您的表格，列的列表將幫助我們更好地協助您。

Answer 2

你的第二個查詢使用錯誤的語法，應該是

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