From c2a79e343c581e3b884f02243eb5b084774ffecd Mon Sep 17 00:00:00 2001
From: Sevinc <sevincquliyeva000@gmail.com>
Date: Sat, 21 Mar 2026 22:07:42 +0400
Subject: [PATCH] lab2 done

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diff --git a/README.md b/README.md
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@@ -1,140 +0,0 @@
-![logo_ironhack_blue 7](https://user-images.githubusercontent.com/23629340/40541063-a07a0a8a-601a-11e8-91b5-2f13e4e6b441.png)
-
-# LAB | SQL Normalization, DDL & Aggregation
-
-### Instructions
-
-1. Fork this repo.
-2. Clone your fork to your local machine.
-3. Solve the challenges.
-
-
-## Deliverables
-
-- Upon completion, add your solution to git.
-- Then commit to git and push to your repo on GitHub.
-- Make a pull request and paste the pull request link in the submission field in the Student Portal.
-
-
-## Exercise 1: Normalize a Blog Database
-
-**Step 1:** Given the following raw dataset, identify redundancies and normalize the data (at least to 3NF).
-
-<br>
-
-| **author**          | **title**                       | **word_count** | **views** |
-|----------------|-----------------------------|------------|-------|
-| Maria Charlotte| Best Paint Colors           | 814        | 14    |
-| Juan Perez     | Small Space Decorating Tips | 1146       | 221   |
-| Maria Charlotte| Hot Accessories             | 986        | 105   |
-| Maria Charlotte| Mixing Textures             | 765        | 22    |
-| Juan Perez     | Kitchen Refresh             | 1242       | 307   |
-| Maria Charlotte| Homemade Art Hacks          | 1002       | 193   |
-| Gemma Alcocer  | Refinishing Wood Floors     | 1571       | 7542  |
-
-<br>
-
-**Step 2:** Write the DDL (`CREATE TABLE` statements) to implement your normalized schema.
-
-**Step 3 (Optional):** Insert the sample data using `INSERT INTO`.
-
-## Exercise 2: Normalize an Airline Database
-
-**Step 1:** Normalize the following data (again, at least up to 3NF):
-
-<br>
-
-| **Customer Name**    | **Customer Status** | **Flight Number** | **Aircraft**    | **Total Aircraft Seats** | **Flight Mileage** | **Total Customer Mileage** |
-| ---------------- | --------------- | ------------- | ----------- | -------------------- | -------------- | ---------------------- |
-| Agustine Riviera | Silver          | DL143         | Boeing 747  | 400                  | 135            | 115235                 |
-| Agustine Riviera | Silver          | DL122         | Airbus A330 | 236                  | 4370           | 115235                 |
-| Alaina Sepulvida | None            | DL122         | Airbus A330 | 236                  | 4370           | 6008                   |
-| Agustine Riviera | Silver          | DL143         | Boeing 747  | 400                  | 135            | 115235                 |
-| Tom Jones        | Gold            | DL122         | Airbus A330 | 236                  | 4370           | 205767                 |
-| Tom Jones        | Gold            | DL53          | Boeing 777  | 264                  | 2078           | 205767                 |
-| Agustine Riviera | Silver          | DL143         | Boeing 747  | 400                  | 135            | 115235                 |
-| Sam Rio          | None            | DL143         | Boeing 747  | 400                  | 135            | 2653                   |
-| Agustine Riviera | Silver          | DL143         | Boeing 747  | 400                  | 135            | 115235                 |
-| Tom Jones        | Gold            | DL222         | Boeing 777  | 264                  | 1765           | 205767                 |
-| Jessica James    | Silver          | DL143         | Boeing 747  | 400                  | 135            | 127656                 |
-| Sam Rio          | None            | DL143         | Boeing 747  | 400                  | 135            | 2653                   |
-| Ana Janco        | Silver          | DL222         | Boeing 777  | 264                  | 1765           | 136773                 |
-| Jennifer Cortez  | Gold            | DL222         | Boeing 777  | 264                  | 1765           | 300582                 |
-| Jessica James    | Silver          | DL122         | Airbus A330 | 236                  | 4370           | 127656                 |
-| Sam Rio          | None            | DL37          | Boeing 747  | 400                  | 531            | 2653                   |
-| Christian Janco  | Silver          | DL222         | Boeing 777  | 264                  | 1765           | 14642                  |
-
-<br>
-
-**Step 2:** Identify functional dependencies and decompose into smaller, related tables:
-- `customers`
-- `flights`
-- `aircrafts`
-- `bookings`
-
-**Step 3:** Write the DDL scripts (`CREATE TABLE` + `FOREIGN KEY` constraints).
-
-**Step 4:** Insert the sample data.
-
-## Exercise 3: Write SQL Queries on the Airline Database
-
-Use the schema you created in Exercise 2 to answer the following:
-
-1. Total number of flights:
-```sql
-SELECT COUNT(DISTINCT flight_number) FROM flights;
-```
-2. Average flight distance:
-```sql
-SELECT AVG(mileage) FROM flights;
-```
-3. Average number of seats per aircraft:
-```sql
-SELECT AVG(total_seats) FROM aircrafts;
-```
-4. Average miles flown by customers, grouped by status:
-```sql
-SELECT status, AVG(total_mileage) FROM customers GROUP BY status;
-```
-5. Max miles flown by customers, grouped by status:
-```sql
-SELECT status, MAX(total_mileage) FROM customers GROUP BY status;
-```
-6. Number of aircrafts with "Boeing" in their name:
-```sql
-SELECT COUNT(*) FROM aircrafts WHERE name LIKE '%Boeing%';
-```
-7. Flights with distance between 300 and 2000 miles:
-```sql
-SELECT * FROM flights WHERE mileage BETWEEN 300 AND 2000;
-```
-8. Average flight distance **booked**, grouped by customer status:
-```sql
-SELECT c.status, AVG(f.mileage)
-FROM bookings b
-JOIN customers c ON b.customer_id = c.id
-JOIN flights f ON b.flight_number = f.flight_number
-GROUP BY c.status;
-```
-9. Most booked aircraft among Gold status members:
-```sql
-SELECT a.name, COUNT(*) AS total_bookings
-FROM bookings b
-JOIN customers c ON b.customer_id = c.id
-JOIN flights f ON b.flight_number = f.flight_number
-JOIN aircrafts a ON f.aircraft_id = a.id
-WHERE c.status = 'Gold'
-GROUP BY a.name
-ORDER BY total_bookings DESC
-LIMIT 1;
-```
-
-## Extra Challenge
-
-- Create `ERD` diagrams to visualize both schemas.
-- Use `CHECK`, `NOT NULL`, and `UNIQUE` constraints where appropriate.
-- Add indexes where you think performance can improve.
-
-<br>
-
-**Have fun querying!** :dart:
\ No newline at end of file
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diff --git a/lab2.sql b/lab2.sql
new file mode 100644
index 0000000..dab1a0a
--- /dev/null
+++ b/lab2.sql
@@ -0,0 +1,180 @@
+use lab_2;
+
+
+
+-- Exercise 1: Normalize a Blog Database
+-- in this exercise relation beween title and author is one to one.
+
+create table titles(
+
+	title_id int auto_increment primary key, 
+    title_name varchar(200), 
+    word_count int, 
+    views int
+);
+
+create table authors (
+
+	author_id int auto_increment primary key, 
+    author_fname varchar(100), 
+    
+    title_id int, 
+    
+    FOREIGN KEY (title_id) REFERENCES titles(title_id)
+
+
+);
+
+insert into titles(title_name, word_count, views) values
+('Best Paint Colors', 814, 14),
+('Small Space Decorating Tips', 1146, 221),
+('Hot Accessories', 986, 105),
+('Mixing Textures', 765, 22),
+('Kitchen Refresh', 1242, 307),
+('Homemade Art Hacks', 1002, 193),
+('Refinishing Wood Floors', 1571, 7542);
+
+
+insert into authors (author_fname, title_id) values
+('Maria Charlotte', 1),
+('Juan Perez', 2),
+('Maria Charlotte', 3),
+('Maria Charlotte', 4),
+('Juan Perez', 5),
+('Maria Charlotte', 6),
+('Gemma Alcocer', 7);
+
+
+
+
+-- Exercise 2: Normalize an Airline Database
+
+
+CREATE TABLE customers (
+   customer_id int NOT NULL AUTO_INCREMENT,
+   customer_name varchar(200) DEFAULT NULL,
+   customer_status varchar(200) DEFAULT 'None',
+   total_customer_mileage int DEFAULT NULL,
+   PRIMARY KEY (customer_id)
+ );
+
+INSERT INTO customers (customer_name, customer_status, total_customer_mileage)
+VALUES
+('Agustine Riviera', 'Silver', 115235),
+('Alaina Sepulvida', 'None', 6008),
+('Tom Jones', 'Gold', 205767),
+('Sam Rio', 'None', 2653),
+('Jessica James', 'Silver', 127656),
+('Ana Janco', 'Silver', 136773),
+('Jennifer Cortez', 'Gold', 300582),
+('Christian Janco', 'Silver', 14642);
+
+CREATE TABLE aircrafts (
+   aircraft_name varchar(45) NOT NULL,
+   total_aircraft_seats int DEFAULT NULL,
+   PRIMARY KEY (aircraft_name),
+   UNIQUE KEY aircraft_name_UNIQUE (aircraft_name)
+ );
+ 
+ 
+INSERT INTO aircrafts (aircraft_name, total_aircraft_seats)
+VALUES
+('Boeing 747', 400),
+('Airbus A330', 236),
+('Boeing 777', 264);
+
+
+CREATE TABLE flights (
+   flight_number varchar(300) NOT NULL,
+   aircraft varchar(45) NOT NULL,
+   flight_mileage int DEFAULT NULL,
+   PRIMARY KEY (flight_number),
+   KEY aircraft_idx (aircraft),
+   CONSTRAINT aircraft FOREIGN KEY (aircraft) REFERENCES aircrafts (aircraft_name)
+ );
+
+INSERT INTO flights (flight_number, aircraft, flight_mileage)
+VALUES
+('DL143', 'Boeing 747', 135),
+('DL122', 'Airbus A330', 4370),
+('DL53', 'Boeing 777', 2078),
+('DL222', 'Boeing 777', 1765),
+('DL37', 'Boeing 747', 531);
+
+CREATE TABLE bookings (
+   customer_id int DEFAULT NULL,
+   flight_number varchar(300) DEFAULT NULL,
+   KEY customer_id_idx (customer_id),
+   KEY flight_number_idx (flight_number),
+   CONSTRAINT customer_id FOREIGN KEY (customer_id) REFERENCES customers (customer_id),
+   CONSTRAINT flight_number FOREIGN KEY (flight_number) REFERENCES flights (flight_number)
+ );
+
+INSERT INTO bookings (customer_id, flight_number)
+VALUES
+(1, 'DL143'),
+(1, 'DL122'),
+(2, 'DL122'),
+(3, 'DL122'),
+(3, 'DL53'),
+(3, 'DL222');
+
+
+-- Exercise 3: Write SQL Queries on the Airline Database
+
+SELECT COUNT(DISTINCT flight_number) FROM flights; -- 5
+
+SELECT AVG(flight_mileage) FROM flights; -- 1775.8000
+
+SELECT AVG(total_aircraft_seats) FROM aircrafts; -- 300.0000
+
+SELECT customer_status, AVG(total_customer_mileage) FROM customers GROUP BY customer_status; 
+-- Silver	98576.5000
+-- None	4330.5000
+-- Gold	253174.5000
+
+SELECT customer_status, MAX(total_customer_mileage) FROM customers GROUP BY customer_status;
+-- Silver	136773
+-- None	6008
+-- Gold	300582
+
+SELECT COUNT(*) FROM aircrafts WHERE aircraft_name LIKE '%Boeing%'; -- 2
+
+SELECT * FROM flights WHERE flight_mileage BETWEEN 300 AND 2000;
+-- DL222	Boeing 777	1765
+-- DL37	Boeing 747	531
+
+
+SELECT c.status, AVG(f.flight_mileage)
+FROM bookings b
+JOIN customers c ON b.customer_id = c.customer_id
+JOIN flights f ON b.flight_number = f.flight_number
+GROUP BY c.customer_status;
+-- DL222	Boeing 777	1765
+-- DL37	Boeing 747	531
+
+
+SELECT a.aircraft_name, COUNT(*) AS total_bookings
+FROM bookings b
+JOIN customers c ON b.customer_id = c.customer_id
+JOIN flights f ON b.flight_number = f.flight_number
+JOIN aircrafts a ON f.aircraft = a.aircraft_name
+WHERE c.customer_status = 'Gold'
+GROUP BY a.aircraft_name
+ORDER BY total_bookings DESC
+LIMIT 1;
+-- Boeing 777	2
+
+
+
+
+
+
+
+
+
+
+
+
+
+