用于显示ul li数据的mysql查询和php代码

Question

我有两张桌子tbl_category

id category 
1   cat1 
2   cat2
3   cat3

第二张桌子Tbl_book

id  cat_id  book_name
1    1      book1
2    1      book2
3    2      book4
4    1      book5

用于显示的mysql查询和php代码

 cat1  book1  book2 book5 
 cat2  book4

Answer 1

怎么样

select c.category, 
       group_concat(b.bookname separator ' ') as books
from tbl_category c
inner join tbl_book b on b.cat_id = c.id
group by c.category