从两个表中计数，并在MYSQL中显示同一个表中的计数

我有两个带有主键和列（名称颜色）的表

我试过了

SELECT  (
        SELECT COUNT(*)
        FROM   table1
        ) AS count1,
        (
        SELECT COUNT(*)
        FROM   table2
    ) AS count2

但这给了

count1|count2| 
 3    |3     |

我怎样才能得到像这样的颜色分组的输出

|Color|count1| count2
|red  | 1    |2
|green| 1    |1
|blue |1     |0

---

您好，您可以使用union和group by

select id,color, sum(coun_t) as counts from (
    (SELECT id,color,count(*) as coun_t FROM `table1` group by color)
          union 
    (SELECT id,color,count(*) as coun_t FROM `table2` group by color)
 ) as p group by color order by id asc

---

您好，您可以使用union和group by

select id,color, sum(coun_t) as counts from (
    (SELECT id,color,count(*) as coun_t FROM `table1` group by color)
          union 
    (SELECT id,color,count(*) as coun_t FROM `table2` group by color)
 ) as p group by color order by id asc

---

结果集中的id列没有多大意义。结果集中的id列没有多大意义。

union

可以删除重复的行，如果出现这种情况，总和将不正确，此答案需要使用

union all

。此外，该问题要求的不是单个总和，而是两列。

union

可以删除重复的行，如果出现这种情况，总和将不正确，此答案需要使用

union all

。此外，该问题不要求一个单一的总和，而是两列。

select id,color, sum(coun_t) as counts from (
    (SELECT id,color,count(*) as coun_t FROM `table1` group by color)
          union 
    (SELECT id,color,count(*) as coun_t FROM `table2` group by color)
 ) as p group by color order by id asc