Assignment two

[cwfling]

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

Adding completed SQL for assignment 2 and the graph

What did you learn from the changes you have made?

There was a lot to learn in this assignment using window functions and NULL handling. Additions and modifications to tables and joins were also covered but used less frequently

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

I'm not sure if I implemented the cross join correctly as it didn't seem necessary to get the same information. It was checked by looking at the cross join output and doing manual calculations of the expected values for the products.

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

The longest time I spent on the questions was the update section. Trying to figure out how to find the most recent entry for the product in a neat fashion and use it took some time. I ended up testing outputs from different methods and chose what I think looked the cleanest

How were these changes tested?

Segmented testing of code

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

Checklist

• [x ] I can confirm that my changes are working as intended

[anjali-deshpande-hub]

Very well done! 68/70

Just one comment - Section 3 Delete: The requirement is to delete the older record for the product added.

You can use MIN(snapshot_timestamp) function. Using the WITH clause and MIN function, identify the earliest snapshot for the product_id and then delete the row that matches that product_id and timestamp.