mysql - 在 MySQL 中选择两个柱状和？

Question

我可以使用 MySQL 中的 SUM() 函数轻松选择一列的总和，如下所示:

SELECT SUM(`someColumn`) FROM `table`

是否也可以使用相同的查询返回第二列的总和？类似这样:

SELECT SUM (`someColumn`, `anotherColumn`) FROM `table`

运行这样的查询会返回以下访问冲突:

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' `anotherColumn`) FROM `table`' at line 1

Answer 1

尝试:

SELECT SUM(COALESCE(`someColumn`, 0)+ COALESCE(`anotherColumn`, 0)) as TotalSum FROM `table`

或者如果你想单独使用它们:

SELECT SUM(`someColumn`) as Sum1, SUM(`anotherColumn`) as Sum2 FROM `table`