sqlite3 now - SQL

Introduction

SQLite is a self-contained, serverless SQL database engine that is used in a wide range of applications. It is commonly used in mobile apps, IoT devices, and other applications that require a lightweight, embedded database engine. SQLite is often used for its simplicity, reliability, and ease of use.

Features

SQLite has a number of features that make it a popular choice for developers:

• Serverless: SQLite does not require a dedicated server or daemon process to be running in the background. This makes it easy to use in embedded systems or applications that do not have the resources to support a full-blown database server.

• Self-contained: SQLite stores all of its data in a single file that can be easily moved between systems or backed up. This makes it easy to manage compared to traditional client-server database systems.

• Cross-platform: SQLite is available on multiple platforms, including Windows, macOS, Linux, and various mobile platforms.

• Full SQL support: SQLite supports a large subset of the SQL language, including SELECT, INSERT, UPDATE, and DELETE statements, as well as complex queries.

• Transactions: SQLite supports transactions, which allow multiple changes to be made to the database in a single atomic operation.

Usage

To get started with SQLite, you can download the SQLite command-line tool from the official website. This tool allows you to create and manage SQLite databases from the command line.

To create a new database, you can use the following command:

sqlite3 mydatabase.db

This will create a new SQLite database file called mydatabase.db. You can then use SQL commands to create tables and insert data into the database.

Here's an example of creating a table in SQLite:

CREATE TABLE users (
  id INTEGER PRIMARY KEY,
  name TEXT,
  email TEXT UNIQUE,
  age INTEGER
);

This creates a table called users with four columns: id, name, email, and age. The id column is the primary key, which means that each row in the table will have a unique ID.

You can then insert data into the table using the INSERT INTO statement:

INSERT INTO users (name, email, age) VALUES ('John Doe', 'john.doe@example.com', 30);

This adds a new row to the users table with the name "John Doe", email address "john.doe@example.com", and age 30.

You can then query the data in the table using the SELECT statement:

SELECT * FROM users;

This will return all rows in the users table.

Conclusion

SQLite is a versatile and reliable choice for developers who need a lightweight, embedded database engine. Its support for a large subset of the SQL language and cross-platform compatibility make it a popular choice for mobile apps and IoT devices.