MYSQL如何将两个连接字段相加

Question

嗨您是否知道如何将两个已定义的字段相加？这是可能的吗？

SELECT SUM(a) as total_a, SUM(b) as total_b, (total_a + total_b) as grand_total
FROM table

如果没有，我怎么能想出这个？

Answer 1

您也可以在内嵌中执行此操作：

find . -iregex '.*afilename[01][0-9][0-3][0-9]'

Answer 2

您需要创建一个子查询。

SELECT sum_ab.total_a + sum_ab.total_b as grand_total
FROM 
  (SELECT SUM(a) as total_a, SUM(b) as total_b
   FROM table
  ) as sum_ab