从PHP中的多个表搜索

Question

I have a site in which I want to allow the users to search as multiple keyword as a string. Suppose I have 3 tables: Subject , Level and users . If user search for Primary Computer Science Male Test , I Want to show the results from joining three tables. That is Primary from table Level and computer Science from table Subjects and remaining from the user table. If the user search for computer science just show the results from table Subject . How it possible using MYSQL query?

Answer 1

User input:

Computer Primary

Compose Query in this way:

select * 
from Subject as s join level as l on s.id = l.subject_id 
   join users as u on u.subject_id = s.id
where 
   l.name = :firstterm or s.name = :firstterm or u.name = :firsterm or
   l.name = :secondterm or s.name = :secondterm or u.name = :secondterm 

Where :firsterm is the first user input term and :secondterm is the scond once