mysql在两列中计数不同的连接

I am trying to count a distinct value in either of two rows. For instance, a table with columns fruit0, fruit1. I can get a count of the distinct values of either row, but I want a count of them combined (note this is a stupid contrived example).

我正在尝试在两行中计算一个不同的值。例如，一个带有列的表，结果是0，结果是1。我可以得到任意一行的不同值的计数，但我希望它们的计数组合在一起(注意这是一个愚蠢的设计示例)。

Example:

例子:

id | fruit0 | fruit1
--------------------
0  | apple  | banana
1  | apple  | pear
2  | apple  | apple
3  | pear   | banana

I want something like:

我希望类似:

fruit | count   
--------------
apple | 4
banana| 2
pear  | 2

1 个解决方案

#1

select fruit_name, count(*) 
FROM
(
   SELECT fruit0 as fruit_name
   FROM table1
   UNION ALL
   SELECT fruit1 as fruit_name
   FROM table1
)aaa
GROUP BY fruit_name