SQL 查询非重复计数问题

Question

我正在尝试获取每个制造商下的型号数量，在 table 我想显示如下内容：

Manufacturer       Models
Honda                7
Ford                 12

例如雅阁、思域等车型...

我怎样才能得到这个数字？在 SQL table 中是这样布局的

Manufacturer       Models
Honda              Accord
Honda              Civic
Ford               F150
Ford               Taurus

等等....

在 table 中，我想像上面那样布局....

Answer 1

使用 GROUP BY and COUNT 和 DISTINCT 的查询：

SELECT  Manufacturer
        ,COUNT(DISTINCT Models) as DistinctModels
FROM    myTable
GROUP BY Manufacturer

Answer 2

select Manufacturer
     , count(*) total_models
from table
group by Manufacturer
order by Manufacturer

或不同的

select Manufacturer
     , count(distinct Models) total_models
from table
group by Manufacturer
order by Manufacturer

SQL Query Distinct Count Issue