lab-sql-basic-queries/

solution.sql

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+-- USE SAKILA DATABASE
+USE sakila;
+
+-- CHALLENGE 1: Display all available tables
+-- Useful for an initial audit of the database structure
+SHOW TABLES;
+
+-- CHALLENGE 2: Retrieve all data from specific tables
+-- Extracting full datasets from actor, film, and customer
+SELECT * FROM actor;
+SELECT * FROM film;
+SELECT * FROM customer;
+
+-- CHALLENGE 3: Retrieve specific columns
+-- 3.1 Titles of all films
+SELECT title FROM film;
+
+-- 3.2 List of languages (with alias)
+SELECT name AS language FROM language;
+
+-- 3.3 List of first names of all employees
+SELECT first_name FROM staff;
+
+-- CHALLENGE 4: Unique release years
+-- Identifying the time range of the movie catalog
+SELECT DISTINCT release_year FROM film;
+
+-- CHALLENGE 5: Counting records for business insights
+-- 5.1 Number of stores
+SELECT COUNT(*) FROM store;
+
+-- 5.2 Number of employees
+SELECT COUNT(*) FROM staff;
+
+-- 5.3 Available inventory vs total rentals
+SELECT COUNT(*) FROM inventory; -- Physical copies
+SELECT COUNT(*) FROM rental;    -- Total transactions
+
+-- 5.4 Number of distinct actor last names
+SELECT COUNT(DISTINCT last_name) FROM actor;
+
+-- CHALLENGE 6: Top 10 longest films
+-- Sorting by duration in descending order
+SELECT title, length FROM film 
+ORDER BY length DESC 
+LIMIT 10;
+
+-- CHALLENGE 7: Filtering techniques
+-- 7.1 Search for actors named SCARLETT
+SELECT * FROM actor WHERE first_name = 'SCARLETT';
+
+-- BONUS CHALLENGES
+-- 7.2 Search by keyword and duration
+SELECT * FROM film 
+WHERE title LIKE '%ARMAGEDDON%' 
+AND length > 100;
+
+-- 7.3 Count films with special features
+SELECT COUNT(*) FROM film 
+WHERE special_features LIKE '%Behind the Scenes%';