commit sql

.gitignore

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+# ================================================================
+# .gitignore for SQL Lab Project
+# ================================================================
+
+# ================================================================
+# IDE and Editor Files
+# ================================================================
+
+# IntelliJ IDEA
+.idea/
+*.iml
+*.iws
+*.ipr
+out/
+
+# Visual Studio Code
+.vscode/
+*.code-workspace
+
+# Sublime Text
+*.sublime-project
+*.sublime-workspace
+
+# Eclipse
+.project
+.metadata
+.classpath
+.settings/
+
+# NetBeans
+nbproject/
+build/
+nbbuild/
+dist/
+nbdist/
+
+# ================================================================
+# Operating System Files
+# ================================================================
+
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+._*
+.Spotlight-V100
+.Trashes
+
+# Windows
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+$RECYCLE.BIN/
+
+# Linux
+*~
+.directory
+
+# ================================================================
+# Database Files
+# ================================================================
+
+# MySQL
+*.sql~
+*.sql.bak
+*.sql.backup
+mysql-data/
+mysql-bin/
+
+# SQLite
+*.db
+*.sqlite
+*.sqlite3
+
+# PostgreSQL
+*.pgsql
+*.dump
+
+# Database backup files
+*.backup
+*.bak
+*.old
+
+# ================================================================
+# Temporary and Log Files
+# ================================================================
+
+# Logs
+*.log
+logs/
+*.log.*
+
+# Temporary files
+*.tmp
+*.temp
+*~
+*.swp
+*.swo
+.*.swp
+
+# Cache
+*.cache
+cache/
+
+# ================================================================
+# Project Specific
+# ================================================================
+
+# Don't ignore the actual SQL solution files
+!exercise1_blog_database.sql
+!exercise2_airline_database.sql
+!exercise3_queries.sql
+!SOLUTION_DOCUMENTATION.sql
+
+# Local database configuration files (if any)
+db-config.local.sql
+credentials.sql
+local-settings.sql
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# ================================================================
+# Archives and Compressed Files
+# ================================================================
+
+# Compressed files (exclude if not needed)
+*.zip
+*.tar
+*.tar.gz
+*.rar
+*.7z
+
+# ================================================================
+# Node.js (if used for any tooling)
+# ================================================================
+
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+package-lock.json
+yarn.lock
+
+# ================================================================
+# Java (if used for any tooling)
+# ================================================================
+
+*.class
+*.jar
+*.war
+*.ear
+target/
+
+# ================================================================
+# Documentation Build Output
+# ================================================================
+
+# PDF outputs (if generating documentation)
+*.pdf
+
+# HTML generated docs (keep markdown sources)
+docs/_build/
+site/
+
+# ================================================================
+# Test and Coverage Reports
+# ================================================================
+
+coverage/
+*.cover
+.coverage
+htmlcov/
+
+# ================================================================
+# Git Attributes
+# ================================================================
+
+# Don't ignore .gitignore itself
+!.gitignore
+!.gitattributes
+

exercise1_blog_database.sql

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+-- ================================================================
+-- Exercise 1: Normalize a Blog Database
+-- ================================================================
+
+-- Step 1: Normalization to 3NF
+-- Original table had redundancy with author names repeated
+-- Normalized into:
+--   - authors table (stores unique authors)
+--   - posts table (stores posts with FK to authors)
+
+-- ================================================================
+-- Step 2: DDL - CREATE TABLE statements
+-- ================================================================
+
+CREATE TABLE authors (
+    author_id INT PRIMARY KEY AUTO_INCREMENT,
+    author_name VARCHAR(100) NOT NULL UNIQUE
+);
+
+CREATE TABLE posts (
+    post_id INT PRIMARY KEY AUTO_INCREMENT,
+    author_id INT NOT NULL,
+    title VARCHAR(255) NOT NULL,
+    word_count INT NOT NULL CHECK (word_count > 0),
+    views INT DEFAULT 0 CHECK (views >= 0),
+    FOREIGN KEY (author_id) REFERENCES authors(author_id)
+);
+
+-- Add index for performance on frequent queries
+CREATE INDEX idx_posts_author ON posts(author_id);
+CREATE INDEX idx_posts_views ON posts(views);
+
+-- ================================================================
+-- Step 3: INSERT sample data
+-- ================================================================
+
+-- Insert authors first (referenced table)
+INSERT INTO authors (author_name) VALUES
+('Maria Charlotte'),
+('Juan Perez'),
+('Gemma Alcocer');
+
+-- Insert posts
+INSERT INTO posts (author_id, title, word_count, views) VALUES
+(1, 'Best Paint Colors', 814, 14),
+(2, 'Small Space Decorating Tips', 1146, 221),
+(1, 'Hot Accessories', 986, 105),
+(1, 'Mixing Textures', 765, 22),
+(2, 'Kitchen Refresh', 1242, 307),
+(1, 'Homemade Art Hacks', 1002, 193),
+(3, 'Refinishing Wood Floors', 1571, 7542);
+
+-- ================================================================
+-- Verification Queries
+-- ================================================================
+
+-- View all data
+SELECT
+    a.author_name,
+    p.title,
+    p.word_count,
+    p.views
+FROM posts p
+JOIN authors a ON p.author_id = a.author_id
+ORDER BY p.post_id;
+
+-- Total posts per author
+SELECT
+    a.author_name,
+    COUNT(*) as total_posts,
+    SUM(p.views) as total_views
+FROM posts p
+JOIN authors a ON p.author_id = a.author_id
+GROUP BY a.author_name
+ORDER BY total_views DESC;
+