SQL Documentation

A comprehensive resource for all things SQL.

Database Concepts

This page provides a basic overview of database concepts.

SQL Basics

SQL stands for Structured Query Language. It's used to interact with databases.

It allows you to define, manipulate, and control data.

SQL is essential for managing and querying data in various database systems. It's fundamental to modern applications.

Different databases use different SQL dialects, but the core concepts remain the same.

Let's quickly look at how to retrieve data:

We'll use the SQL command SELECT to fetch some sample data.

SELECT * FROM users;

This will display all the data in the users table.

``` ```css /* style.css */ body { font-family: 'Helvetica Neue', sans-serif; margin: 20px; background-color: #f4f4f4; color: #333; } header { background-color: #333; color: #fff; padding: 20px; text-align: center; margin-bottom: 20px; } main { padding: 20px; background-color: #eee; border-radius: 8px; box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); } section { margin-bottom: 20px; padding: 20px; border: 1px solid #ddd; border-radius: 4px; background-color: #fff; } article { max-width: 800px; margin: 0 auto; padding: 20px; border: 1px solid #ddd; border-radius: 4px; text-align: left; } img { width: 200px; height: auto; margin-bottom: 20px; border: 1px solid #ddd; border-radius: 4px; object-fit: cover; } footer { margin-top: 30px; padding: 20px; background-color: #333; color: #fff; text-align: center; font-size: 0.8em; } ``` ```javascript // script.js document.addEventListener('DOMContentLoaded', function () { // Example Data (replace with a real database connection) const users = [ { id: 1, name: 'Alice', email: 'alice@example.com' }, { id: 2, name: 'Bob', email: 'bob@example.com' }, { id: 3, name: 'Charlie', email: 'charlie@example.com' }, ]; // Function to retrieve data function getUsers() { return users; } //Example query let query = "SELECT * FROM users;"; console.log(query); console.log("Query result:", users); console.log("Query result (with params):", users.filter(user => user.id === 1)) } );