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    <p>Check out this <a href="http://www.tizag.com/mysqlTutorial/" rel="nofollow">link</a> for a mysql introduction and the <a href="http://en.wikipedia.org/wiki/Relational_database" rel="nofollow">wikipedia</a> article on relational databases. Read about tables, primary and foreign keys. Before worrying about performance you need to address the structure of your database.</p> <p>Try (<a href="http://www.tomjewett.com/dbdesign/dbdesign.php?page=association.php" rel="nofollow">One-to-Many</a>:A student can own many pieces of music and have one friend):</p> <pre><code>CREATE TABLE Student( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), first_name VARCHAR(30), last_name VARCHAR(30), friend_id INT) CREATE TABLE Music( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), music_title VARCHAR(30), music_student_id INT) FOREIGN KEY (music_student_id) REFERENCES Student(id) ON DELETE CASCADE </code></pre> <p>Or Try (<a href="http://www.tomjewett.com/dbdesign/dbdesign.php?page=manymany.php" rel="nofollow">Many-to-Many</a>:Many students can own many pieces of music and have many friends):</p> <pre><code>CREATE TABLE Student( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), first_name VARCHAR(30), last_name VARCHAR(30)) FOREIGN KEY (id) REFERENCES StudentMusic (Student_id) ON DELETE CASCADE CREATE TABLE Music( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), music_title VARCHAR(30), FOREIGN KEY (id) REFERENCES StudentMusic (Music_id) ON DELETE CASCADE CREATE TABLE StudentMusic ( Student_id INT NOT NULL AUTO_INCREMENT, Music_id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (Student_id,Music_id) CREATE TABLE Friendships( student_A_id INT, student_B_id INT) PRIMARY KEY (student_A_id,student_B_id) </code></pre> <p>Handling the data views of the relationships can be shown using a Select statement. In the One-to-Many design finding a Student's music uses the following query:</p> <pre><code>Select Student.first_name,Student.last_name,Music.music_title FROM Student LEFT JOIN Music on (Student.ID=Music.music_student_id) </code></pre> <p>Part of designing a database is figuring out what relationships you will need to query.</p> <p>Also look into <a href="http://en.wikipedia.org/wiki/Database_normalization" rel="nofollow">normalizing databases</a>.</p>
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    1. COyou are right I should not be worried about performance but I am kinda of serious about writing code. I should choose the best solution.
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    2. COBeing serious is fine but you usually choose an extensible design until you need more performance.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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