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？与此类似：

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

运行此类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`

或者如果你想分开这些：

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

Answer 2

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

Answer 3

一种更简单的方法：

SELECT col1, col2, col3, (col1+col2+col3) AS Total FROM table;

Answer 4

如果要对多个列求和，只需选择多个列的总和即可。

如果您只想要总列数，可以执行以下操作：

SELECT SUM(col1+col2+...+coln) AS all_total

如果您想将总和分开，您可以这样做：

SELECT SUM(col1) AS total1, SUM(col2) AS total2, ..., SUM(coln) AS totaln

在MySQL中选择两个柱状和？

4 个答案: