来自差异值SQL的SELECT，DISTINCT和COUNT数据

Question

如何区分值，并根据此数据计算来自差异值的数据

   NAME |                  NAME | TOTAL
    A   |                   A   |   4
    A   |                   B   |   2
    A   |     INTO THIS
    A   |
    B   |
    B   |

我已经尝试过此查询

SELECT DISTINCT(name) ,COUNT(DISTINCT(NAME)) FROM tbl_a

但它只显示，即使我使用分组，并按...排序。

NAME |  TOTAL
 A   |    4

Answer 1

你可以这样做：

select NAME, COUNT(NAME)  
from tbl_a
group by NAME;

Answer 2

SELECT COUNT(DISTINCT name_column) AS some_alias FROM table_name