In MySql you will often start by creating and selecting which database to use. You need a database to store data, so this is a logically place to start. In this article, we will learn how to create databases in mysql.
We will be using docker in this article, but feel free to install your database locally instead. Once you have docker installed, create a new file called
docker-compose.yml and add the following.
version: '3' services: db: image: mysql:latest container_name: db environment: MYSQL_ROOT_PASSWORD: root_pass MYSQL_DATABASE: app_db MYSQL_USER: db_user MYSQL_PASSWORD: db_user_pass ports: - "6033:3306" volumes: - dbdata:/var/lib/mysql phpmyadmin: image: phpmyadmin/phpmyadmin container_name: pma links: - db environment: PMA_HOST: db PMA_PORT: 3306 PMA_ARBITRARY: 1 restart: always ports: - 8081:80 volumes: dbdata:
Now, navigate to
http://localhost:8081/ to access phpMyAdmin. Then log in with the username
root and pass
Click the SQL tab and you are ready to go.
To create a database, we can use the
CREATE DATABASE statement. For example, let’s create a database called "sakila" named after the example database we will be using for many tutorial (insert link).
CREATE DATABASE sakila;
Next, in MySql, we must select the database we want to use. We can do this by using the
Now, MySql knows we want to be sending command using the sakila database.
The using sql scripts to import existing schemas, we often want to check if a database exists before we create. We can do this a few ways. First, we can use the
SHOW DATABASES command to list the current databases.
The output is as follows:
+--------------------+ | Database | +--------------------+ | sakila| | information_schema | | mysql | | performance_schema | | sys | +--------------------+
Now, if we see the database, we can know to not create it. However, MySQL also has a handy command called
IF NOT EXISTS that we can use when creating a database. If we use this clause, the database will only be created if it does not exists.
CREATE DATABASE IF NOT EXISTS sakila;