What changes are you trying to make? (e.g. Adding or removing code, refactoring existing code, adding reports)

An entity-relationship diagram was created with a .pdf file, followed by SQL queries in a .sql file with my personal comments. The queries include selecting specific columns or rows, deriving new columns, recategorizing values, using wildcards (e.g., %), and filtering based on defined conditions like total amount spent.

What did you learn from the changes you have made?

I learned how to write and run basic SQL queries in SQLite, get a better familiarity of how to use Git commands to push updates to GitHub again, and have a good grasp of applying entity-relationship diagrams to visualize the structure of a database with multiple tables.

Was there another approach you were thinking about making? If so, what approach(es) were you thinking of?

I considered using both VS Code and DB Browser to run SQL queries, as it would be a good window to get familiar with each tool and compare results. However, I realized it is more effective to focus on one tool at a time, especially at first, and switch to the next when ready.

Were there any challenges? If so, what issue(s) did you face? How did you overcome it?

One challenge was getting familiar with the structure of SQL queries. Unlike languages like R or Python, I felt like SQL has a more rigid, predefined order for its keywords, which I think will take more time to get used to. Working on small additional projects myself could be a helpful way to reinforce my learning in a short period of time.

How were these changes tested?

Once I completed a query, I often tried alternative methods, if available, to see if I could achieve the same results. I also reviewed the raw dataset to check for consistency between the output and the original data, which I think is important.

A reference to a related issue in your repository (if applicable)

None.

Checklist

• I can confirm that my changes are working as intended