从多个表自动完成搜索

Eg:

**Category Table**

Catg_id   Catg_name    
-------------------
1         Bike  
2         Car  

**Company Table**    
Company_id   Company_name  
--------------------------
1             Bajaj
2             Honda   

**Company_category table**

com_catg_id   Company_id   Category_id
---------------------------------------
1              1            1
2              2            1
3              2            2

** Models table**
Model_id      Model_name    com_catg_id
----------------------------------------
1             Pulsar 220    1
2             Unicorn       2
3             City          3

**Purchase Table***

Purchase_id   Vehicle_No      Rate     model_id    status
-------------------------------------------------------  
1              KL 02 AN8306   50000    2           0
2              KL 10 AZ4764   120000   1           1
3              KL 04 AV8578   800000   3           1

These are 4 Database tables using.
I am using ajax for auto complete searching through a single field

eg: searching car, want to list all cars in purchase table of status 1
if searching bike, want to list all bike in purchase table of status 1
search using company name, want to list all vehicle from that company in purchase table of status 1
same as search using model name, vehicle no,rate want to list matched items in purchase table

Please help me and please send a mysql query for implementing this.

Check this tut This would surely help you. This tutorial is for single field. It isn't hard to modify the code and use for multiple fields