SQL查询不同计数问题

Question

我正在尝试让每个制造商下的模型数量，在一个表格中我希望显示如下：

Manufacturer       Models
Honda                7
Ford                 12

以模特为例，一致，公民等......

我怎么能算得上这个数字？在SQL表中，它的布局如下

Manufacturer       Models
Honda              Accord
Honda              Civic
Ford               F150
Ford               Taurus

... ETC

在一张桌子上，我想像我上面那样摆出来......

Answer 1

使用GROUP BY和COUNT与DISTINCT进行查询：

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