group by和where的用法select * from peizhi where tag$row[tag] group by brand这样写是错的。实现的是把
group by和where的用法
select * from peizhi where tag=$row[tag] group by brand
这样写是错的。实现的是把以tag为条件把相同里面brand信息给取出来，并且是通过group by的方式取出来brand
[解决办法]
select * from peizhi where tag=$row['tag'] group by brand