SQL Fundamentals

SQL Fundamentals Course

SQL Fundamentals

Master the essential skills for working with relational databases. Learn SQL syntax, data types, table creation, and database design principles for real-world applications.

SQL Database Creation Example

-- Create E-commerce Database
CREATE DATABASE ecommerce_db;

USE ecommerce_db;

-- Create Users Table
CREATE TABLE Users (
    user_id INT PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(50) UNIQUE NOT NULL,
    email VARCHAR(100) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    full_name VARCHAR(100),
    date_of_birth DATE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    is_active BOOLEAN DEFAULT TRUE
);

-- Create Products Table
CREATE TABLE Products (
    product_id INT PRIMARY KEY AUTO_INCREMENT,
    product_name VARCHAR(200) NOT NULL,
    description TEXT,
    price DECIMAL(10, 2) NOT NULL,
    stock_quantity INT DEFAULT 0,
    category VARCHAR(50),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Create Orders Table
CREATE TABLE Orders (
    order_id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT,
    order_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    total_amount DECIMAL(10, 2) NOT NULL,
    status VARCHAR(20) DEFAULT 'pending',
    FOREIGN KEY (user_id) REFERENCES Users(user_id)
);

Module 1: SQL Syntax & Data Types

Introduction to SQL
Understanding SQL Statements (DDL, DML, DCL, TCL)
Basic SQL Syntax Rules
Keywords, Identifiers, and Syntax Conventions
SQL Data Types Overview
Numeric Types (INT, BIGINT, DECIMAL, FLOAT)
Character Types (CHAR, VARCHAR, TEXT)
Date & Time Types (DATE, TIME, DATETIME, TIMESTAMP)
Boolean and Binary Types
Choosing the Right Data Type
Real-Life Example: Designing a “Users” table

Module 2: Creating Databases & Tables

Introduction to DDL (Data Definition Language)
Creating a Database: CREATE DATABASE
Selecting/Using a Database
Creating Tables: CREATE TABLE
Defining Columns and Constraints
Setting Primary Keys
Using AUTO_INCREMENT / SERIAL
Modifying Tables with ALTER TABLE
Adding, Modifying, and Deleting Columns
Dropping Databases & Tables
Best Practices for Table Structure
Practical E-commerce Exercise

Comprehensive SQL Coverage

Learn all essential SQL statements and data types

Real-World Examples

Practical exercises based on actual database scenarios

Best Practices

Industry-standard database design principles

Hands-On Exercises

Build complete database schemas from scratch

Practical Exercise: E-commerce Database

Build a Complete E-commerce Database

In this practical exercise, you’ll create a fully functional database for an e-commerce application:

Design and create a Users table with proper data types
Create a Products table with inventory management
Build an Orders table with foreign key relationships
Implement proper constraints and defaults
Apply best practices for database design
Test your schema with sample data

Key SQL Concepts You’ll Master

Data Definition Language (DDL)

CREATE DATABASE & CREATE TABLE
ALTER TABLE operations
DROP TABLE & DROP DATABASE
Primary Key and Foreign Key constraints
UNIQUE and CHECK constraints
Index creation and management

Data Types & Best Practices

Choosing between CHAR vs VARCHAR
Numeric precision with DECIMAL
Date and time storage strategies
Text data storage with TEXT types
Boolean and binary data handling
Performance considerations for data types

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