mysql - 对不同字段中的相同值进行分组和计数

Question

我的英语不好，所以我向您展示我需要的示例。

包含这些列的表格:

id | name1 | name2

我需要将这两个查询的结果转换为一个

SELECT name1, COUNT(name1) as a
FROM partidos
GROUP BY name1
ORDER BY a DESC;

SELECT name2, COUNT(name2) as b
FROM partidos
GROUP BY name2
ORDER BY b DESC;

结果是“a + b”，我需要在一个查询中得到这个总和。

示例:

1 | james | carolina
2 | carolina | rupert
3 | mordor | james
4 | carolina | mordor
5 | paul | carolina

结果:

carolina 4
james 2
mordor 2
rupert 1
paul 1

Answer 1

如果要计算name1和name2中“名称”的数量，请使用union all:

select name, count(*)
from ((select name1 as name
       from partidos
      ) union all
      (select name2 as name
       from partidos
      )
     ) p
group by name
order by count(*) desc;