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±í1 content

content_id  name(str)
1  ÕÅÈý
2  ÀîËÄ

±í2 illcate
illcate_id  cate(str)
1    µç¹¤
2  ľ¹¤
3  ÔÓ¹¤


±í3 content_ills
id  content_id  illcate_id
1    1            1
1    1            2
1    2            1
1    2            4


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1  ÕÅÈý      µç¹¤/ľ¹¤
2  ÀîËÄ      µç¹¤/ÔÓ¹¤
select a.content_id,a.name,group_concat(c.cate) from content a
inner join content_ills b on a.content_id=b.content_id
inner join illcate c on b.illcate_id=c.illcate_id
group by a.content_id,a.name

SQL code:
select a.content_id,a.name,replace(group_concat(c.cate),',','/')
from content a,content_ills b,illcate d
where a.content_id=b.content_id
and b.illcate_id=c.illcate_id
group by a.content_id,a.name



select a.content_id,a.name,group_concat(c.cate SEPARATOR '/') from content a
inner join content_ills b on a.content_id=b.content_id


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select * from table whe ......
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