Mysqli PHP查询计数

Question

我该如何查询并得到这样的结果丰田（3）？ 这是我的数据库结构。

Make | Model | Total Cars | 

Toyota | Vios | 1   | 

Toyota | Hilux | 2   | 

Answer 1

试试这个

select `Make`, sum(`Total Cars`) from table_name group by `Make`; 

Answer 2

您也可以尝试此查询：

SELECT count(*) as cnt FROM tableName WHERE Make='Toyota' 

如果你想显示所有品牌woth计数然后

SELECT count(*) as cnt FROM tableName Group By Make 

Answer 3

您可以使用sum与group by来计算特定品牌的库存。

select sum(totalcars) from cars group by make 

演示：http://sqlfiddle.com/#!9/d6503/1

要包括make它添加到select查询：

select sum(totalcars), make from cars group by make 

http://sqlfiddle.com/#!9/d6503/2