Related Product by Tag words - Solution

I have got a nice solution for the tag keyword and related post problem.

Here I want to illustrate the problem first. Suppose you have few books to post with some keywords.

C++ in 7 days	Book, Programming, computer, C
Advance MySql	Book ,Programming, computer, database
Harry Potter	Novel, Fantasy,
Anatomy handbook	Book, Medical
Advance C	Programming, computer, C

Now whenever I want to view the related books of c++ in 7 days. The books will be as following as the tag weight

1. Advance C

2. Advance MYSql

3. Anatomy book.

But the problem I described at the previous post is I have to query each time for each tag. To solve this problem I used the ‘TOXI Solution’ Method.

I split the books and tags into two different db tables. And they have many to many relationships (m n).

Book: bookId(PK), Book Name

Tag: tagId(PK), tagWord

And to develop the relationship another relational table

TagMap: Id(PK), bookId(FK), tagId(FK)

Now the query will be

SELECT b.*,@p1 = ''

FROM TagMap bt, Book b, Tag t

WHERE bt.tagId = t.tagId

AND (t.tagId IN (SELECT @p1 := tagId FROM TagMap WHERE bookId = '1'))

AND b.id = bt.bookId AND b.id <> '1'

GROUP BY b.id

HAVING (COUNT( b.id )<= count(@p1) AND COUNT(b.id) >= 1) LIMIT 0,3