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aritlce表
--------------------------
aid aname acontent
1 hehe hehehe
2 hehe hehehe
3 hehe hehehe
--------------------------
tag表
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tid tname
1 php
2 smarty
--------------------------
tag-article表
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aid tid
1 1
1 2
2 1
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aritlce表 (aid, aname, acontent,tname)
tag表(tid,tname)
tag-article表(aid, tid,tcount)