Merge pull request #106 from GeekTrainer/main

Updates for relational module

2-Working-With-Data/05-relational-databases/README.md

@@ -58,6 +58,8 @@ Let's return to our data and determine how we want to split things up. We know w
 
 But before we create the next table, we need to figure out how to reference each city. We need some form of an identifier, ID or (in technical database terms) a primary key. A primary key is a value used to identify one specific row in a table. While this could be based on a value itself (we could use the name of the city, for example), it should almost always be a number or other identifier. We don't want the id to ever change as it would break the relationship. You will find in most cases the primary key or id will be an auto-generated number.
 
+> [!NOTE] Foreign key is frequently abbreviated as PK
+
 ### cities
 
 | city_id | City     | Country       |
@@ -84,7 +86,9 @@ With our cities table created, let's store the rainfall. Rather than duplicating
 | 8           | 3       | 2019 | 942    |
 | 9           | 3       | 2020 | 1176   |
 
-Notice the **city_id** column inside the newly created **rainfall** table. This column contains values which reference the IDs in the **cities** table. In technical relational data terms, this is called a foreign key; it's a primary key from another table. You can just think of it as a reference or a pointer. **city_id** 1 references Tokyo.
+Notice the **city_id** column inside the newly created **rainfall** table. This column contains values which reference the IDs in the **cities** table. In technical relational data terms, this is called a **foreign key**; it's a primary key from another table. You can just think of it as a reference or a pointer. **city_id** 1 references Tokyo.
+
+> [!NOTE] Foreign key is frequently abbreviated as FK
 
 ## Retrieving the data
 
@@ -158,7 +162,7 @@ Relational databases are centered around dividing information between multiple t
 
 ## 🚀 Challenge
 
-TBD
+There are numerous relational databases available on the internet. You can explore the data by using the skills you've learned above.
 
 ## Post-Lecture Quiz
 
@@ -166,7 +170,11 @@ TBD
 
 ## Review & Self Study
 
-## [SQL content on Microsoft Learn](https://docs.microsoft.com/learn/browse/?products=azure-sql-database%2Csql-server&expanded=azure&WT.mc_id=academic-40229-cxa)
+There are several resources available on [Microsoft Learn](https://docs.microsoft.com/learn?WT.mc_id=academic-40229-cxa) for you to continue your exploration of SQL and relational database concepts
+
+- [Describe concepts of relational data](https://docs.microsoft.com//learn/modules/describe-concepts-of-relational-data?WT.mc_id=academic-40229-cxa)
+- [Get Started Querying with Transact-SQL](https://docs.microsoft.com//learn/paths/get-started-querying-with-transact-sql?WT.mc_id=academic-40229-cxa) (Transact-SQL is a version of SQL)
+- [SQL content on Microsoft Learn](https://docs.microsoft.com/learn/browse/?products=azure-sql-database%2Csql-server&expanded=azure&WT.mc_id=academic-40229-cxa)
 
 ## Assignment
 

2-Working-With-Data/05-relational-databases/assignment.md

@@ -1,8 +1,59 @@
-# Title
+# Displaying airport data
+
+You have been provided a [database](https://raw.githubusercontent.com/Microsoft/Data-Science-For-Beginners/main/2-Working-With-Data/05-relational-databases/airports.db) built on [SQLite](https://sqlite.org/index.html) which contains information about airports. The schema is displayed below. You will use the [SQLite extension](https://marketplace.visualstudio.com/items?itemName=alexcvzz.vscode-sqlite&WT.mc_id=academic-40229-cxa) in [Visual Studio Code](https://code.visualstudio.com?WT.mc_id=academic-40229-cxa) to display information about different cities' airports.
 
 ## Instructions
 
+To get started with the assignment, you'll need to perform a couple of steps. You'll need to install a bit of tooling and download the sample database.
+
+### Setup your system
+
+You can use Visual Studio Code and the SQLite extension to interact with the database.
+
+1. Navigate to [code.visualstudio.com](https://code.visualstudio.com?WT.mc_id=academic-40229-cxa) and follow the instructions to install Visual Studio Code
+1. Install the [SQLite extension](https://marketplace.visualstudio.com/items?itemName=alexcvzz.vscode-sqlite&WT.mc_id=academic-40229-cxa) extension as instructed on the Marketplace page
+
+### Download and open the database
+
+Next you will download an open the database.
+
+1. Download the [database file from GitHub](https://raw.githubusercontent.com/Microsoft/Data-Science-For-Beginners/main/2-Working-With-Data/05-relational-databases/airports.db) and save it to a directory
+1. Open Visual Studio Code
+1. Open the database in the SQLite extension by selecting **Ctl-Shift-P** (or **Cmd-Shift-P** on a Mac) and typing `SQLite: Open database`
+1. Select **Choose database from file** and open the **airports.db** file you downloaded previously
+1. After opening the database (you won't see an update on the screen), create a new query window by selecting **Ctl-Shift-P** (or **Cmd-Shift-P** on a Mac) and typing `SQLite: New query`
+
+Once open, the new query window can be used to run SQL statements against the database. You can use the command **Ctl-Shift-Q** (or **Cmd-Shift-Q** on a Mac) to run queries against the database.
+
+> [!NOTE] For more information about the SQLite extension, you can consult the [documentation](https://marketplace.visualstudio.com/items?itemName=alexcvzz.vscode-sqlite&WT.mc_id=academic-40229-cxa)
+
+## Database schema
+
+A database's schema is its table design and structure. The **airports** database as two tables, `cities`, which contains a list of cities in the United Kingdom and Ireland, and `airports`, which contains the list of all airports. Because some cities may have multiple airports, two tables were created to store the information. In this exercise you will use joins to display information for different cities.
+
+| Cities           |
+| ---------------- |
+| id (PK, integer) |
+| city (text)      |
+| country (text)   |
+
+| Airports                         |
+| -------------------------------- |
+| id (PK, integer)                 |
+| name (text)                      |
+| code (text)                      |
+| city_id (FK to id in **Cities**) |
+
+## Assignment
+
+Create queries to return the following information:
+
+1. all city names in the `Cities` table
+1. all cities in Ireland in the `Cities` table
+1. all airport names with their city and country
+1. all airports in London, United Kingdom
+
 ## Rubric
 
-Exemplary | Adequate | Needs Improvement
---- | --- | -- |
+| Exemplary | Adequate | Needs Improvement |
+| --------- | -------- | ----------------- |