我试图找到一个MySQL查询,它将在特定字段中找到不同的值,计算该值出现的次数,然后对结果进行排序。
我知道如何处理一行(仅名称1):

SELECT name1, COUNT( * ) AS count
FROM table
GROUP BY name1
ORDER BY `count` ASC

这可能是2行或更多行,还是我需要以前的查询多次?
例子:
    id         name1        name2
    -----      ------       ------
    1          Mark         Paul
    2          Mike         John
    3          Paul         Mike
    4          Cleo         Bert
    5          Mike         Cleo
    6          John         Mark
    7          Mark         Cleo

结果:
    names      count1       count2
    ------     -------      ------
    Bert       0            1
    Cleo       1            2
    john       1            1
    Mark       2            1
    Mike       2            1
    Paul       1            1

最佳答案

SELECT name1, COALESCE(sum(count1),0) as count1, COALESCE(sum(count2),0) as count2
FROM
(
   select name1, count(*) as count1, null as count2 from your_table group by name1
   union all
   select name2, null, count(*) from your_table group by name2
) tmp
GROUP BY name1
ORDER BY name1 ASC

关于mysql - 多列计数不同值的出现,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/29986466/

10-15 18:29