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Added databases and example code to support the lecture notes.
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‎.gitignore‎

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# mypy
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.mypy_cache/
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# Exercise files - update when the course starts!
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IndEx1_STU_NUM.py
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IndEx1_STU_NUM.sql

‎IndEx1_STU_NUM.py‎

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"""
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Provide Python code to create a SQLite database.
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Your solution may make use of either Python with sqlite3 OR Python with sqlalchemy.
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The structure of the database must be as follows:
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Database name: Blog
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Table names: Blogger, Post
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Columns for Blogger table: blogger_id (integer, Foreign Key), username (text), email (text)
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Columns for Post table: post_id (integer, Primary Key), title (text), post (text), blogger_id (integer, Foreign Key)
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Add the following records to each table:
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[Blogger]
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1, weatherman, [email protected]
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2, gourmand123, [email protected]
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[Post]
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1, Weather, Today the weather is fine., 1
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2, Lunch, Fish and chips with ice-cream., 2
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3, Dinner, Green thai-curry for main with mango sticky rice for dessert., 2
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"""
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‎IndEx1_STU_NUM.sql‎

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/*
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Write queries to answer the following questions
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Save your work to this .sql file
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Right click on the file name in the Project pane and select Refactor > Rename, and replace STU_NUM with your student number.
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*/
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--1. Which employees have 'IT' in their job title? (list their EmployeeId, FirstName, LastName and Title)
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SELECT EmployeeId, FirstName, LastName, Title FROM Employee WHERE Title LIKE "IT%";
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--2. List the names of all Artists and the titles of their albums
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SELECT Artist.Name, Album.title FROM Artist JOIN Album ON Artist.ArtistId = Album.ArtistId ORDER BY Artist.Name;
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--3. Which track is features on the greatest number of times in playlists and how many times is it included? (display Trac
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SELECT Track.Name, COUNT(PlaylistTrack.TrackId) FROM Track JOIN PlaylistTrack ON Track.TrackId = PlaylistTrack.TrackId LIMIT 5;
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--4. Provide a list of the number of tracks by each artist
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--5. How much money has been invoiced for the artist Deep Purple? (display each line item from the invoices and the total amount)
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SELECT Artist.Name, SUM(InvoiceLine.UnitPrice*InvoiceLine.Quantity) FROM Artist
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JOIN Album on Artist.ArtistId = Album.ArtistId
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JOIN Track on Album.AlbumId = Track.AlbumId
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JOIN InvoiceLine on Track.TrackId = InvoiceLine.TrackId
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WHERE Artist.Name LIKE "Deep Purple";
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UPDATE InvoiceLine SET Quantity=2 WHERE InvoiceLineId=96;
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UPDATE InvoiceLine SET Quantity=3 WHERE InvoiceLineId=129;
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UPDATE InvoiceLine SET Quantity=4 WHERE InvoiceLineId=130;
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SELECT Artist.Name, InvoiceLine.InvoiceLineId, InvoiceLine.UnitPrice, InvoiceLine.Quantity FROM Artist
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JOIN Album on Artist.ArtistId = Album.ArtistId
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JOIN Track on Album.AlbumId = Track.AlbumId
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JOIN InvoiceLine on Track.TrackId = InvoiceLine.TrackId
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WHERE Artist.Name LIKE "Deep Purple";
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/*
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Provide SQL to create a SQLite database with the following:
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Database name: Blog
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Table names: Blogger, Post
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Columns for Blogger table: blogger_id (integer, Foreign Key), username (text), email (text)
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Columns for Post table: post_id (integer, Primary Key), title (text), post (text), blogger_id (integer, Foreign Key)
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Add the following records to each table:
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[Blogger]
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1, weatherman, [email protected]
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2, gourmand123, [email protected]
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[Post]
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1, Weather, Today the weather is fine., 1
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2, Lunch, Fish and chips with ice-cream., 2
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3, Dinner, Green thai-curry for main with mango sticky rice for dessert., 2
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*/
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‎chinook.sqlite‎

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‎chinook_queries.sql‎

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--Provide a query showing Customers (just their full names, customer ID and country) who are not in the US.
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--Provide a query only showing the Customers from Brazil.
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/* Provide a query showing the Invoices of customers who are from Brazil.
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Show the customer's full name, Invoice ID, Date of the invoice and billing country.*/
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‎chinook_queries_solutions.sql‎

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--Provide a query showing Customers (just their full names, customer ID and country) who are not in the US.
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SELECT FirstName, LastName, CustomerId, Country
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from Customer
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WHERE Country NOT IN ("USA");
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--Provide a query only showing the Customers from Brazil.
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SELECT FirstName, LastName
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FROM Customer
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WHERE Country LIKE "Brazil";
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/* Provide a query showing the Invoices of customers who are from Brazil.
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Show the customer's full name, Invoice ID, Date of the invoice and billing country.*/
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SELECT InvoiceId, InvoiceDate, BillingCountry, FirstName, LastName
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FROM Customer
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JOIN Invoice ON Customer.CustomerId = Invoice.CustomerId
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WHERE Country LIKE "Brazil";

‎create_db_mysql.py‎

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import mysql.connector
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from mysql.connector import errorcode
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DB_NAME = 'address_mysql'
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# 1. Create the connection object (replace with your username and password for mysql)
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conn = mysql.connector.connect(
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host="localhost",
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user="comp0034",
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passwd="c0mpoo34",
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port=8889
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)
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# 2. Create the cursor object
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c = conn.cursor()
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# 3. Create the database and the use it
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c.execute("CREATE DATABASE IF NOT EXISTS address_mysql DEFAULT CHARACTER SET 'utf8'")
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c.execute("USE address_mysql")
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# 4. Create the tables
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sql = '''CREATE TABLE `person` (
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`person_id` int NOT NULL AUTO_INCREMENT,
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`first_name` varchar(14) NOT NULL,
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`last_name` varchar(16) NOT NULL,
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PRIMARY KEY (`person_id`)
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) ENGINE=InnoDB'''
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c.execute(sql)
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sql = '''CREATE TABLE `address` (
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`address_id` int NOT NULL AUTO_INCREMENT,
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`street_number` varchar(6) NOT NULL,
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`street_name` varchar(120) NOT NULL,
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`postcode` varchar(10) NOT NULL,
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`person_id` int NOT NULL,
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PRIMARY KEY (`address_id`),
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FOREIGN KEY (`person_id`) REFERENCES `person` (`person_id`)
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) ENGINE=InnoDB'''
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c.execute(sql)
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# 4. Insert muliple rows into person
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values = [('David', 'Coverdale'),
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('Robert', 'Plant'),
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('Joe', 'Elliott')]
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sql = ("INSERT INTO person (first_name, last_name) VALUES (%s, %s)")
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c.executemany(sql, values)
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# 5. Insert single row into address (for the last person entered)
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sql = "INSERT INTO address (street_number, street_name, postcode, person_id) VALUES (%s, %s, %s, %s)"
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values = (12, 'My Road', 'SE1 9PZ', c.lastrowid)
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c.execute(sql, values)
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# 6. Insert address for a specific person (first select the id of the person and then insert the new address record)
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sql = '''INSERT INTO address (street_number, street_name, postcode, person_id) VALUES (%s, %s, %s,
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(SELECT person_id FROM person WHERE last_name LIKE "Plant"))'''
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values = (134, 'The Street', 'EN7 3RT')
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c.execute(sql, values)
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# 7. Commit the changes
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conn.commit()
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# 8. Close the cursor and the connection
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c.close()
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conn.close()

‎create_db_sqlalchemy.py‎

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from sqlalchemy import Column, ForeignKey, Integer, String
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import relationship, sessionmaker
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from sqlalchemy import create_engine
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# 1. Create an engine that stores data in a address_alchemy.db file in the local directory
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# The engine establishes a DBAPI connection to the database when a method like execute() or connect() is called
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engine = create_engine('sqlite:///address_sqlalchemy.db')
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# 2. Describe the model (i.e. the database tables and the classesmapped to those)
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# Create the declarative base class. This stores a catlog of classes and mapped tables using the Declarative system
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Base = declarative_base()
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# Define the classes and tables
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class Person(Base):
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__tablename__ = 'person'
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person_id = Column(Integer, primary_key=True)
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first_name = Column(String(250), nullable=False)
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last_name = Column(String(250), nullable=False)
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address = relationship("Address")
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def __repr__(self):
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return "<Person(id='%s', first_name='%s', last name='%s')>" % (self.person_id, self.first_name, self.last_name)
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class Address(Base):
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__tablename__ = 'address'
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address_id = Column(Integer, primary_key=True)
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street_name = Column(String(120))
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street_number = Column(String(6))
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post_code = Column(String(10))
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person_id = Column(Integer, ForeignKey('person.person_id'))
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def __repr__(self):
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return "<Address('%s', '%s', '%s)>" % (
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self.street_number, self.street_name, self.post_code)
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# 3. Create all tables
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Base.metadata.create_all(engine)
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# 4. Create a session object to allow us to interact with the database
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# Session class is defined using sessionmaker() – a configurable session factory method which is bound to the engine
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# object created earlier.
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Session = sessionmaker(bind=engine)
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session = Session()
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# 5. Create people objects then add to the database using the session object
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p1 = Person(first_name='R2', last_name='D2')
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session.add(p1)
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session.add_all([
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Person(first_name='Metal', last_name='Mickey'),
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Person(first_name='Marvin', last_name='Paranoid-Android'),
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Person(first_name='K', last_name='9')]
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)
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# 4. Create address objects and add to the database
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# Add a person and their address
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et = Person(first_name='E.', last_name='T.')
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# Address has to be a list even if there is only one address
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et.address = [Address(street_number='1A', street_name='Brodo Asogi', post_code='')]
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session.add(et)
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# Add an address for an existing person
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p2 = session.query(Person).filter_by(first_name='Metal').first()
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p2.address = [Address(street_number='34', street_name='Wilberforce Street', post_code='B4 7ET')]
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# 5. Commit the changes to the database
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session.commit()
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# 6. Close the session
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session.close()

‎create_db_sqlite.py‎

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import sqlite3
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# Step 1: Create a connection object that represents the database
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conn = sqlite3.connect('address_sqlite.db')
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# Step 2: Create a cursor object
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c = conn.cursor()
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# Step 3: Create the person and address tables
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c.execute('''
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CREATE TABLE person
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(person_id INTEGER PRIMARY KEY,
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first_name text NOT NULL,
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last_name text NOT NULL)
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''')
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c.execute('''
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CREATE TABLE address
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(address_id INTEGER PRIMARY KEY,
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street_number text,
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street_name text,
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postcode text NOT NULL,
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person_id INTEGER NOT NULL,
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FOREIGN KEY(person_id) REFERENCES person(person_id))
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''')
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# Insert data for a person using values from variables
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# You could use: c.execute("INSERT INTO person VALUES('Jo', 'Bloggs')")
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sql = "INSERT INTO person (first_name, last_name) VALUES (?, ?)"
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values = ('Jo', 'Bloggs')
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c.execute(sql, values)
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# Insert the address for the person
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# If you know the rowid you can use: c.execute("INSERT INTO address VALUES(1, 'My Road', 'SE1 9PZ', 1)")
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# Since we just inserted Jo this was the last insert so we can get the id of the last inserted row using c.lastrowid:
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sql = "INSERT INTO address ('street_number', street_name, postcode, person_id) VALUES (?, ?, ?, ?)"
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values = (12, 'My Road', 'SE1 9PZ', c.lastrowid)
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c.execute(sql, values)
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# Insert multiple rows cursor.executemany()
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sql = "INSERT INTO person (first_name, last_name) VALUES (?, ?)"
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values = [('David', 'Coverdale'),
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('Robert', 'Plant'),
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('Joe', 'Elliott')]
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c.executemany(sql, values)
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# Step 5: Save (commit) the changes
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conn.commit()
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# Step 6 (optional): Close the connection if you are done with it
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# Be sure any changes have been committed or they will be lost.
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conn.close()

‎requirements.txt‎

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mysql-connector-python==8.0.17
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protobuf==3.9.0
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six==1.12.0
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SQLAlchemy==1.3.5

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