我有3张桌子。
Mark
id_mark
mark_name
example record:
1, 'Ford'
2, 'Fiat'
Model
id_model
id_mark
mondel_name
example record:
1, 1, 'Focus'
2, 2, 'Panda'
Adds
id_adds
id_model
name
price
etc.
example records:
1 1 'My ad', 20000
2 1 'My ad2', 30000
3 2 'My ad3', 30000
如何执行返回结果的查询(“标记添加计数”)示例:
Ford 2
Fiat 1
2 and 1 count