chigo01/alx-backend-storage

📖 alx-backend-storage.

📃 Topics Covered.

1. MySQL advanced.

🔧 Project setup.

## Install MySQL 5.7 in ubuntu
# Create signature key
sudo echo "-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.1.6
Comment: Hostname: pgp.mit.edu

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=Xqbo
-----END PGP PUBLIC KEY BLOCK-----" >> signature.key

# Add key to server
sudo apt-key add signature.key

# Add apt repo
sudo sh -c 'echo "deb http://repo.mysql.com/apt/ubuntu bionic mysql-5.7" >> /etc/apt/sources.list.d/mysql.list'

sudo apt-get update

# Check mysql available versions
sudo apt-cache policy mysql-server

# Install mysql 5.7
sudo apt install -f mysql-client=5.7* mysql-community-server=5.7* mysql-server=5.7*

# Check if installed
mysql --version


# Create project directory and readme.
mkdir ./alx-backend-storage/
touch ./alx-backend-storage/README.md

cd alx-backend-storage

# Create git repository.
git init
git add .
git commit -m 'first commit'
git remote add origin <REMOTE_URL>
git push

💻 Projects

0x00. MySQL advanced

🔧 Project setup.

# Create project directory and readme.
mkdir ./0x00-MySQL_Advanced/
touch ./0x00-MySQL_Advanced/README.md
cd 0x00-MySQL_Advanced

👉 Go to project

0. We are all unique!

Write a SQL script that creates a table users following these requirements:

• With these attributes:
  • id, integer, never null, auto increment and primary key
  • email, string (255 characters), never null and unique
  • name, string (255 characters)
• If the table already exists, your script should not fail
• Your script can be executed on any database

Context: Make an attribute unique directly in the table schema will enforced your business rules and avoid bugs in your application

bob@dylan:~$ echo "SELECT * FROM users;" | mysql -uroot -p holberton
Enter password: 
ERROR 1146 (42S02) at line 1: Table 'holberton.users' doesn't exist
bob@dylan:~$ 
bob@dylan:~$ cat 0-uniq_users.sql | mysql -uroot -p holberton
Enter password: 
bob@dylan:~$ 
bob@dylan:~$ echo 'INSERT INTO users (email, name) VALUES ("[email protected]", "Bob");' | mysql -uroot -p holberton
Enter password: 
bob@dylan:~$ echo 'INSERT INTO users (email, name) VALUES ("[email protected]", "Sylvie");' | mysql -uroot -p holberton
Enter password: 
bob@dylan:~$ echo 'INSERT INTO users (email, name) VALUES ("[email protected]", "Jean");' | mysql -uroot -p holberton
Enter password: 
ERROR 1062 (23000) at line 1: Duplicate entry '[email protected]' for key 'email'
bob@dylan:~$ 
bob@dylan:~$ echo "SELECT * FROM users;" | mysql -uroot -p holberton
Enter password: 
id  email   name
1   [email protected]   Bob
2   [email protected]    Sylvie
bob@dylan:~$ 

🔧 Project setup.

# Create project directory and readme.
mkdir ./0-uniq_users.sql/
touch ./0-uniq_users.sql/README.md
cd 0-uniq_users.sql

👉 Go to project

0x02. Python - Async Comprehension

Type Annotation (Strongly Dynamically typed) in python. Reason for implementing type Annotation:

1. Code documentation.
2. Linting and validation.

🔧 Project setup.

# Create project directory and readme.
mkdir ./0x02-python_async_comprehension/
touch ./0x02-python_async_comprehension/README.md
cd 0x02-python_async_comprehension

👉 Go to project

👨 Author and Credits.

This project was done by SE. Tolulope Fakunle. Feel free to get intouch with me;

📱 WhatsApp [phone]

📧 Email [email protected]

👍 A lot of thanks to ALX-Africa Software Engineering program for the project requirements.