更新子查詢中的多個列

Question

這種類型的東西以前曾被問過幾次，但並不完全是我在尋找的東西。我需要SET兩行等於子查詢的不同部分。

我目前正在使用：

UPDATE records 
SET leads=(SELECT COUNT(*) FROM leads_table WHERE leads_table.blah=records.blah), 
earnings=(SELECT SUM(amount) FROM leads_table WHERE leads_table.blah=records.blah) 

的WHERE語句得到明顯簡化...但基本上它同子查詢，但我不認爲我應該被運行兩次呢？

我想要做這樣的事情......

UPDATE records 
SET (leads,earnings)=(SELECT COUNT(*),SUM(amount) FROM leads_table WHERE leads_table.blah=records.blah) 

Answer 1

你可以簡單地加入的表中做一些計算子查詢，

UPDATE records a 
     INNER JOIN 
     (
      SELECT blah, 
        COUNT(*) totalCount, 
        SUM(amount) totalSum 
      FROM leads_table 
      GROUP BY blah 
     ) b ON b.blah = a.blah 
SET  a.leads = b.totalCount 
     a.earnings = b.totalSum