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Add SQL JOIN examples, update resources and links in lesson notebooks.
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‎SQL-Northwind-Lesson-Exercises.ipynb

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},
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{
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"cell_type": "markdown",
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"id": "0999b96c-72b1-4f3e-bf8d-73adf98d95c8",
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"id": "4bea2a7d-5823-4ff6-bc05-4b0c87b8e9e0",
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"metadata": {},
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"source": [
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"<a id='ex4'></a>\n",
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"### Exercise 4: Joining Tables\n",
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"\n",
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"**Objective:** Combine data from multiple tables using joins.\n",
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"\n",
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"- **Tasks:**\n",
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" - List all orders along with the `CompanyName` of the customer who placed each order.\n",
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" ```sql\n",
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" SELECT Orders.OrderID, Customers.CompanyName\n",
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" FROM Orders\n",
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" INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;\n",
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" ```\n",
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" - Retrieve a list of products along with their supplier's `CompanyName`.\n",
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" - Find all orders processed by the employee with `LastName` 'Fuller'."
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"Review these resources:\n",
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" - <a href=\"https://medium.com/swlh/the-best-visual-to-explain-sql-joins-612b95c81555\">The Best Visual To Explain SQL JOINs | by Junji Zhi | The Startup | Medium</a>\n",
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" - <a href=\"https://blog.codinghorror.com/a-visual-explanation-of-sql-joins/\">A Visual Explanation of SQL Joins</a>\n",
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" - <a href=\"https://www.atlassian.com/data/sql/sql-join-types-explained-visually\">Visualizing SQL Joins | Atlassian</a>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "6d32b473-5cfd-4927-bd03-670901c7e1bb",
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"metadata": {},
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"outputs": [],
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"source": [
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"%%sql -- List all orders along with the `CompanyName` of the customer who placed each order.\n",
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"SELECT Orders.OrderID, Customers.CompanyName\n",
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"FROM Orders\n",
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"INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;"
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]
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},
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{
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},
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{
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"cell_type": "markdown",
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"id": "f5309bc4-629b-4b8a-a9b6-7a0bc44e3e6d",
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"id": "c6af1111-6e08-4625-8f51-fdcbbee2f81d",
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"metadata": {},
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"source": [
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"<a id='ex5'></a>\n",
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"### Exercise 5: Aggregate Functions and GROUP BY\n",
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"\n",
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"**Objective:** Use aggregate functions to summarize data.\n",
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"\n",
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"- **Tasks:**\n",
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" - Calculate the total number of orders.\n",
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" ```sql\n",
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" SELECT COUNT(*) AS TotalOrders FROM Orders;\n",
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" ```\n",
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" - Find the average `UnitPrice` of all products.\n",
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" - Determine the number of customers in each country.\n",
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" ```sql\n",
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" SELECT Country, COUNT(*) AS NumberOfCustomers\n",
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" FROM Customers\n",
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" GROUP BY Country;\n",
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" ```"
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"**Objective:** Use aggregate functions to summarize data."
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "e49cac8d-cdf3-4e2d-baa8-6686f525e825",
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"metadata": {},
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"outputs": [],
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"source": [
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"%%sql -- Calculate the total number of orders.\n",
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" SELECT COUNT(*) AS TotalOrders FROM Orders;"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "fad21a05-07bb-4fa6-b3f9-cee5a0f188f5",
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"metadata": {},
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"outputs": [],
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"source": [
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"%%sql -- Determine the number of customers in each country.\n",
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"SELECT Country, COUNT(*) AS NumberOfCustomers\n",
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"FROM Customers\n",
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"GROUP BY Country;"
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]
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},
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{
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},
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{
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"cell_type": "markdown",
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"id": "aab1594f-5e1e-482b-89c7-1824505b0bb0",
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"id": "92f18575-6b60-4e35-af83-819429cc872f",
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"metadata": {},
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"source": [
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"<a id='ex6'></a>\n",
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"### Exercise 6: Advanced Joins and Subqueries\n",
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"\n",
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"**Objective:** Solve complex queries using advanced SQL techniques.\n",
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"\n",
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"**Tasks:**\n",
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" - List employees and the total number of orders they have processed.\n",
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" ```sql\n",
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" SELECT Employees.LastName, COUNT(Orders.OrderID) AS NumberOfOrders\n",
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" FROM Employees\n",
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" LEFT JOIN Orders ON Employees.EmployeeID = Orders.EmployeeID\n",
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" GROUP BY Employees.LastName;\n",
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" ```\n",
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" - Find products that have never been ordered.\n",
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" - Retrieve customers who have not placed any orders in 2019."
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"**Objective:** Solve complex queries using advanced SQL techniques."
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "d0ee7627-5c93-45bb-a41d-8b956f71264c",
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"metadata": {},
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"outputs": [],
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"source": [
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"%%sql -- List employees and the total number of orders they have processed.\n",
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"SELECT Employees.LastName, COUNT(Orders.OrderID) AS NumberOfOrders\n",
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"FROM Employees\n",
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"LEFT JOIN Orders ON Employees.EmployeeID = Orders.EmployeeID\n",
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"GROUP BY Employees.LastName;"
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]
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},
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{
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"## Additional Resources\n",
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"\n",
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"- **SQLite Documentation:** [https://www.sqlite.org/docs.html](https://www.sqlite.org/docs.html)\n",
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"- **SQL Tutorial:** [W3Schools SQL Tutorial](https://www.w3schools.com/sql/)\n",
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"- **SQLite Command Line Reference:** [https://www.sqlite.org/cli.html](https://www.sqlite.org/cli.html)\n",
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"- **SQL Tutorial Cheatsheet:** [https://www.sqltutorial.org/sql-cheat-sheet/](https://www.sqltutorial.org/sql-cheat-sheet/)\n",
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"- **SQLite Browser Wiki:** [SQLite Browser GitHub Wiki](https://github.com/sqlitebrowser/sqlitebrowser/wiki)\n",
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"- **Northwind Database Schema:** [Schema Diagram](https://github.com/jpwhite3/northwind-SQLite3/blob/master/Northwind_ERD.png)"
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"- **Northwind SQLite Repo:** [Github Repo](https://github.com/jpwhite3/northwind-SQLite3/)\n",
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"- **Northwind Database Schema:** [Schema Diagram](https://github.com/jpwhite3/northwind-SQLite3/blob/main/docs/Northwind_ERD.png)"
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]
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},
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{

‎SQL-Northwind-Lesson-Overview.ipynb

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"## Additional Resources\n",
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"\n",
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"- **SQLite Documentation:** [https://www.sqlite.org/docs.html](https://www.sqlite.org/docs.html)\n",
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"- **SQL Tutorial:** [W3Schools SQL Tutorial](https://www.w3schools.com/sql/)\n",
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"- **SQLite Command Line Reference:** [https://www.sqlite.org/cli.html](https://www.sqlite.org/cli.html)\n",
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"- **SQL Tutorial Cheatsheet:** [https://www.sqltutorial.org/sql-cheat-sheet/](https://www.sqltutorial.org/sql-cheat-sheet/)\n",
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"- **SQLite Browser Wiki:** [SQLite Browser GitHub Wiki](https://github.com/sqlitebrowser/sqlitebrowser/wiki)\n",
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"- **Northwind Database Schema:** [Schema Diagram](https://github.com/jpwhite3/northwind-SQLite3/blob/master/Northwind_ERD.png)"
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"- **Northwind SQLite Repo:** [Github Repo](https://github.com/jpwhite3/northwind-SQLite3/)\n",
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"- **Northwind Database Schema:** [Schema Diagram](https://github.com/jpwhite3/northwind-SQLite3/blob/main/docs/Northwind_ERD.png)"
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]
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},
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{

‎Simple-SQLite-Lesson.ipynb

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"FROM people;"
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]
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},
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{
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"cell_type": "markdown",
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"id": "6b2b175c-725d-4f79-b04f-951086541841",
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"metadata": {},
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"source": [
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"<a id='resources'></a>\n",
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"## Additional Resources\n",
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"\n",
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"- **SQLite Documentation:** [https://www.sqlite.org/docs.html](https://www.sqlite.org/docs.html)\n",
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"- **SQLite Command Line Reference:** [https://www.sqlite.org/cli.html](https://www.sqlite.org/cli.html)\n",
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"- **SQL Tutorial Cheatsheet:** [https://www.sqltutorial.org/sql-cheat-sheet/](https://www.sqltutorial.org/sql-cheat-sheet/)\n",
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"- **SQLite Browser Wiki:** [SQLite Browser GitHub Wiki](https://github.com/sqlitebrowser/sqlitebrowser/wiki)\n",
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"- **Northwind SQLite Repo:** [Github Repo](https://github.com/jpwhite3/northwind-SQLite3/)\n",
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"- **Northwind Database Schema:** [Schema Diagram](https://github.com/jpwhite3/northwind-SQLite3/blob/main/docs/Northwind_ERD.png)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "c0723794-cff4-47e0-aa50-505724b38436",
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"id": "164ab25c-9975-4cb6-aac4-639b57d2afd8",
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"metadata": {},
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"outputs": [],
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"source": []

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