PHP and MySQL Database Connection and Table Creation

To create database only once, use the below syntax.

CREATE DATABASE IF NOT EXISTS yourDatabaseName;

To create table only once, use the below syntax −

CREATE TABLE IF NOT EXISTS yourTableName
(
   yourColumnName yourDatatype,
   .
   .
   .
   N
);

Let us implement both the above syntaxes to create database and table only once if does not already exist −

mysql> CREATE DATABASE IF NOT EXISTS login;
Query OK, 1 row affected (0.23 sec)

Above query creates a database successfully.

Following is the query to create a table −

mysql> CREATE TABLE IF NOT EXISTS DemoTable
(
   Id int
);
Query OK, 0 rows affected (0.56 sec)

Above query creates a table successfully.