Advance searching in MySQL according to synonym words - mysql

Question

I have three tables, which are below with related details
1. Primary words
+----+---------+
| id | word |
+----+---------+
| 1 | Machine |
+----+---------+
| 2 | phone |
+----+---------+
2. Alternative words
+----+------------+-----------+
| id | primary_id | word |
+----+------------+-----------+
| 1 | 1 | system |
+----+------------+-----------+
| 2 | 1 | feature |
+----+------------+-----------+
| 3 | 2 | telephone |
+----+------------+-----------+
3. product table
+----+------------------+
| id | name |
+----+------------------+
| 1 | mobile system |
+----+------------------+
| 2 | computer machine |
+----+------------------+
| 3 | wired telephone |
+----+------------------+
Now twist is that whenever user search with "machine" in product table then display results of product with table name have "machine" or "system" or "feature" and if search with "system" or "feature" then also display results of "machine" or "system" or "feature".or vice vera.
Would you please suggest me how can solve this one?

Answer 1

If I understand correctly what you are asking...
SQL
SELECT *
FROM Product P
WHERE EXISTS(SELECT fw.Word --(6) select all products that exist in this query
FROM (SELECT pw.Word --(1) select all Primary words matching input
FROM PrimaryWords pw
WHERE pw.Word = 'machine'
UNION --(3) union the results from both selects
SELECT aw.Word --(2) select all Alternative words that match input or have its primary matching it
FROM PrimaryWords pw INNER JOIN AlternativeWords aw
ON pw.Id = aw.PrimaryId
WHERE pw.Word = 'machine'
OR aw.Word = 'machine') as fw --(4) alias the result
WHERE p.Name LIKE '%' || fw.Word || '%'); -- (5) filter products that match the valid words
you can read the comments ordered by the numbering in ().

Answer 2

First of all you need to take those two table data inti one and then give condition.
Select word from(
SELECT id,word FROM PrimaryWords
Union all
Select primaryid,word from AlternativeWords a
) where id in ( select id from primarywords where word='yoursearchketword'
Union
Select primaryid from AlternativeWords where word='yoursearchketword')
Updated Answer as per your product table.
Now you need to cross join the product table, because there is no relationship between them.
One more thing is you have to use like operator here to compare you desired result with prouct table's name column. Here I have given small idea How to accomplish that, but you can easily improve the same.
Select a.word,b.name from
(Select word from(
SELECT id,word FROM PrimaryWords
Union all
Select primaryid,word from AlternativeWords a
) where id in ( select id from primarywords where word='yoursearchketword'
Union
Select primaryid from AlternativeWords where word='yoursearchketword')) a, product b
Where a.word LIKE CONCAT('%',name, '%');

Answer 3

I suggest to put it in one table like this:
id | primary_id | word
1 | 1 | machine
2 | 2 | phone
3 | 1 | system
4 | 1 | feature
5 | 2 | telephone
And the query will be like this, lets take machine word as an example:
Select word from MyTable where primary_id in
(select primary_id from MyTable where word = "machine")
The output: machine, system, feature
Update
In case you have more columns, for example to show how much related are these words, you can add one more table to map between words, like the following:
id | w1_id | w2_id | relation
1 | 1 | 3 | 80
2 | 2 | 5 | 90
3 | 1 | 4 | 60
4 | 3 | 4 | 60
And the words table will list only the words like:
id| word
1 | machine
2 | phone
3 | system
4 | feature
5 | telephone
In this thread you will find a long discussion talking about way you have to design the layout of your schema as well as hints in how retrieve your data.