当我已经计算总行数时如何计算mysql中分组的行数

Question

我有下表，我想执行以下操作：

1. 计算每个项目在表格中出现的次数

2. 计算DISTINCT物品的数量

3. 按名称对项目进行分组

   +-------+---------+
   |  id   |  names  |
   +-------+---------+
   |   1   |  Apple  |
   |   2   |  Orange | 
   |   3   |  Grape  | 
   |   4   |  Apple  | 
   |   5   |  Apple  | 
   |   6   |  Orange | 
   |   7   |  Apple  | 
   |   8   |  Grape  |  
   +-------+---------+
   

   对于 1. 和 3. 点，我有以下查询效果很好：

   SELECT * , 
      COUNT(names) as count_name, 
      FROM tbl_products WHERE type = '1' 
      GROUP BY names
   

   所以我得到：

   Apple  (4)
   Orange (2)
   Grape  (2)
   

现在我还想计算按行分组的数量并添加一行来计算不同的元素，但是存在一些问题，因为 MySQL 接受查询但无法输出结果：

SELECT * , 
   COUNT(names) as count_name, 
   COUNT(DISTINCT names) as count_total 
   FROM tbl_products WHERE type = '1' 
   GROUP BY names

任何人都可以建议可能是什么问题？

编辑：为了获得更多许可，我想要一张这样的桌子：

    +-------+---------+------------+-------------+
    |  id   |  names  |  count_ctg | count_total |
    +-------+---------+------------+-------------+
    |   1   |  Apple  |      4     |      3      |
    |   2   |  Orange |      2     |      3      |
    |   3   |  Grape  |      2     |      3      |
    +-------+---------+------------+-------------+

Answer 1

1-.统计每一项在表中出现的次数：

SELECT names, count(names) FROM tbl_products WHERE type = '1' group by names

2-. 表中存在多少个不同的项目：

SELECT DISTINCT names FROM tbl_products WHERE type = '1'

3-. 按名称对项目进行分组：

SELECT count(DISTINCT names) as Total FROM tbl_products WHERE type = '1'

作为您的最后一次编辑（全部合一）：

SELECT id, names, count(names), total FROM tbl_products, (select count(distinct names) as total from tbl_products) as total WHERE type = '1' group by names