從多個表中搜索在php

Question

我有一個網站，我想讓用戶搜索多個關鍵字作爲字符串。 假設我有3個表格：Subject,Level和users。如果用戶搜索Primary Computer Science Male Test, 我想顯示加入三個表格的結果。這是表Level和computer Science中的Primary，其來自表Subjects，剩餘的來自user表。如果用戶搜索computer science只顯示錶Subject的結果。如何使用MYSQL查詢？

Answer 1

用戶輸入：

Computer Primary 

撰寫查詢這樣：

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 

其中：firsterm是第一個用戶輸入項和：secondterm是scond一次