How To Create Database

In this tutorial, we will learn how to create a database from scratch. Databases are an essential part of any application or website, as they store and manage data efficiently. By the end of this tutorial, you will be able to create your own database using SQL (Structured Query Language).

Step 1: Install a Database Management System (DBMS)

A Database Management System (DBMS) is software that allows you to create, manage, and query databases. There are various DBMS options available, and in this tutorial, we will use MySQL as our example.

  • Download and install MySQL from the official MySQL website.
  • Follow the installation process and take note of your MySQL root password.

Once the installation is complete, check if MySQL is working by opening the command prompt and typing:

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mysql -u root -p

Enter your MySQL root password when prompted.

Step 2: Create a New Database

To create a new database, you have to execute an SQL query. Run the following SQL command to create a new database called “sample_db”:

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CREATE DATABASE sample_db;

Here, “sample_db” is the name of the new database. You can replace it with your desired database name.

After running the command, you should see a message indicating that the query has been executed successfully.

Step 3: Create Tables in the Database

Now that our database is created, we need to create tables to store data. For example, let’s create a table called “users” that will store user information. Run the following SQL command:

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USE sample_db;
CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    first_name VARCHAR(50) NOT NULL,
    last_name VARCHAR(50) NOT NULL,
    email VARCHAR(50) UNIQUE NOT NULL,
    password VARCHAR(255) NOT NULL
);

This will create a table called “users” with the following columns:

  • id: an integer value that is automatically incremented for each new record, and serves as the primary key.
  • first_name: a variable-length character field with a maximum length of 50 characters, not nullable.
  • last_name: same as first_name, but for the last name.
  • email: a unique variable-length character field, not nullable.
  • password: a variable-length character field with a maximum length of 255 characters, not nullable.

Step 4: Insert Data into the Table

To insert data into the table, you can use the INSERT INTO command. For example, let’s insert a user into our “users” table:

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INSERT INTO users (first_name, last_name, email, password)
VALUES ('John', 'Doe', '[email protected]', 'password123');

This SQL command adds a new record to the users table with the given information.

Step 5: Querying (Select) Data from the Table

Now that we have inserted some data, we can use the SELECT command to query the stored data. For example, to retrieve all records from the “users” table:

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SELECT * FROM users;

This will display all the records from the users’ table.

Full Code

Here’s the full code of the SQL commands used in this tutorial:

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CREATE DATABASE sample_db;
USE sample_db;
 
CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    first_name VARCHAR(50) NOT NULL,
    last_name VARCHAR(50) NOT NULL,
    email VARCHAR(50) UNIQUE NOT NULL,
    password VARCHAR(255) NOT NULL
);
 
INSERT INTO users (first_name, last_name, email, password)
VALUES ('John', 'Doe', '[email protected]', 'password123');
 
SELECT * FROM users;

Output

Conclusion

In this tutorial, we have learned how to create a database, create tables in the database, insert data into tables, and query the stored data using SQL commands.

The process is essential for managing and storing data for applications and websites.

With a solid foundation in SQL and database management, you can build complex and robust applications.