A database holds one or multiple tables.
The CREATE DATABASE statement is used to create a database in MySQL.
get PHP to execute the statement above we must use the mysql_query() function. This function is used
to send a query or command to a MySQL connection.
The Below example creates a database called "my_db":
The CREATE TABLE statement is used to create a table in MySQL.
To learn more about SQL, please visit our SQL tutorial.
We must add the CREATE TABLE statement to the mysql_query() function to execute the command.
The Below example creates a table named "Persons", with three columns. The column names
will be "FirstName", "LastName" and "Age":
Important: A database must be selected before a table can be created. The database is
selected with the mysql_select_db() function.
Note: When you create a database field of type varchar, you must specify the maximum
length of the field, e.g. varchar(15).
The data type specifies what type of data the column can hold. For a complete reference of all
the data types available in MySQL, go to our complete Data
Every table should have a primary key field.
A primary key is used to uniquely identify the rows in a table. Each primary key value must be
unique within the table. Furthermore, the primary key field cannot be null because the database
engine requires a value to locate the record.
The Below example sets the personID field as the primary key field. The primary key field is
often an ID number, and is often used with the AUTO_INCREMENT setting. AUTO_INCREMENT
automatically increases the value of the field by 1 each time a new record is added. To ensure
that the primary key field cannot be null, we must add the NOT NULL setting to the field.
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