查询以获取mysql中的sum和distinct

Question

我在表格中有这样的数据：

==================== 
class | in   | out 
==================== 
1       35      5
2       37      3

我想要这样的结果：

============================ 
Info  |   class    | total
      | 1   |   2  |
============================ 
in      35    37       72
out     5      3        8

那么如何在mysql中进行查询以获得这些结果呢？

请帮助我，我已多次尝试但未成功

由于

Answer 1

将两个支点与UNION组合在一起。

SELECT "in" AS Info,
       MAX(CASE WHEN class = 1 THEN `in` END) AS class1,
       MAX(CASE WHEN class = 2 THEN `in` END) AS class2,
       SUM(`in`) AS total
FROM yourTable
UNION
SELECT "out" AS Info,
       MAX(CASE WHEN class = 1 THEN `out` END) AS class1,
       MAX(CASE WHEN class = 2 THEN `out` END) AS class2,
       SUM(`out`) AS total
FROM yourTable

DEMO