如何使用php和mysql将外键字段链接到另一个表的主键字段？

Question

I got 2 tables for example a USER TABLE with id as primary key(auto-increment) and a BOOKING TABLE with userid as foreign key (integer) of id in user table. Using phpmyadmin mysql database.

How do i write a php script where i can link this two fields together so that they are always related? So when the user enters name and books a tour on the web form, it does everything automatically on the backend.

I am new to php and mysql and searched so many forums and watch tutorials but still dont have a clue. Please help!

Answer 1

What you are currently looking is how to join multiple tables. The query below uses an INNER JOIN which displays only records which has matches on both tables.

SELECT  a.*, b.*
FROM    User a
        INNER JOIN Booking b
            ON a.ID = b.userID
// WHERE    ..conditions here..

To further gain more knowledge about joins, kindly visit the link below:

• Visual Representation of SQL Joins