MySQL列成行[重复]

Question

我正在尝试根据表中的列创建一个列表并对值求和。我有下表

id | box1 | box2 | box3
------------------------
111 | 1 | 0 | 1
111 | 0 | 1 | 1
111 | 1 | 1 | 1
111 | 0 | 0 | 1

我需要这样的结果

column | sum
------------
box1 | 2
box2 | 2
box3 | 4

我尝试合并所有并选择每一列，但我能够获得正确的列标题。我能够得到总和，但我不知道如何获取列名。

SELECT SUM(box1) as box1Count FROMqueue
UNION ALL
SELECT SUM(box2) as box2Count FROM queue
UNION ALL
SELECT SUM(box3) as box3Count FROM queue

Answer 1

您可以在SELECT 子句中对列值进行硬编码：

SELECT 'box1' AS col, SUM(box1) as box1Count FROM queue
UNION ALL
SELECT 'box2', SUM(box2) as box2Count FROM queue
UNION ALL
SELECT 'box3', SUM(box3) as box3Count FROM queue