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MySQL Create Tables

The table creation command requires:

· Name of the table

· Names of fields

· Definitions for each field

Syntax:

Here is generic SQL syntax to create a MySQL table:

CREATE TABLE table_name (column_name column_type);

Now we will create following table in TUTORIALS database.

tutorials_tbl(

   tutorial_id INT NOT NULL AUTO_INCREMENT,

   tutorial_title VARCHAR(100) NOT NULL,

   tutorial_author VARCHAR(40) NOT NULL,

   submission_date DATE,

   PRIMARY KEY ( tutorial_id )

);

Here few items need explanation:

· Field Attribute NOT NULL is being used because we do not want this field to be NULL. SO if user will try to create a record with NULL value then MySQL will raise an error.

· Field Attribute AUTO_INCREMENT tells to MySQL to go ahead and add the next available number to the id field.

· Keyword PRIMARY KEY is used to define a column as primary key. You can use multiple columns separated by comma to define a primary key.

Creating Tables from Command Prompt:

This is easy to create a MySQL table from mysql> prompt. You will use SQL command CREATE TABLE to create a table.

Example:

Here is an example which creates tutorials_tbl:

root@host# mysql -u root -p

Enter password:*******

mysql> use TUTORIALS;

Database changed

mysql> CREATE TABLE tutorials_tbl(

   -> tutorial_id INT NOT NULL AUTO_INCREMENT,

   -> tutorial_title VARCHAR(100) NOT NULL,

   -> tutorial_author VARCHAR(40) NOT NULL,

   -> submission_date DATE,

   -> PRIMARY KEY ( tutorial_id )

   -> );

Query OK, 0 rows affected (0.16 sec)

mysql>

NOTE: MySQL does not terminate a command until you give a semi colon (;) at the end of SQL command.

Creating Tables Using PHP Script:

To create new table in any existing database you would need to use PHP function mysql_query(). You will pass its second argument with proper SQL command to create a table.

Example:

Here is an example to create a table using PHP script:

<html>
<head>
<title>Creating MySQL Tables</title>
</head>
<body>

<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);

if(! $conn )
{

die('Could not connect: ' . mysql_error());

}

echo 'Connected successfully<br />';

$sql = "CREATE TABLE tutorials_tbl( ".

       "tutorial_id INT NOT NULL AUTO_INCREMENT, ".

       "tutorial_title VARCHAR(100) NOT NULL, ".

       "tutorial_author VARCHAR(40) NOT NULL, ".

       "submission_date DATE, ".

       "PRIMARY KEY ( tutorial_id )); ";

mysql_select_db( 'TUTORIALS' );
$retval = mysql_query( $sql, $conn );

if(! $retval )
{

die('Could not create table: ' . mysql_error());

}

echo "Table created successfully\n";
mysql_close($conn);
?>
</body>
</html>