SQL Assignment2

[dipachatterjee]

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

I made logic data models, used various queries in sql, and reflected on the ethical implications of LLMs.

What did you learn from the changes you have made?

I learnt how to work in sql with more complexity and how to structure multiple types of queries and what outputs they gave (COALESCE, windowed functions, ranking, string manipulation, UNION, Cross Join, INSERT, DELETE, UPDATE). I also learnt how to make a logic data model for a database from scratch, including what the keys are and how to assess relations between tables.

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

I followed the assignment's instructions and completed the sql assignment in DB Browser.

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

The major challenge for me was getting used to the SQL syntax and nesting multiple functions within a query. Google and Stack Overflow were very helpful, and otherwise just practising on a few different conditions I created for myself from the database. But I definitely still need to practise a lot more!

How were these changes tested?

The codes were run in relation to the farmer's market database, and I checked most outputs by going into the actual table and manually filtering/calculating.

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

N/A

Checklist

• I can confirm that my changes are working as intended

[anjali-deshpande-hub]

Very well done! 68/70

There is only problem in the Section 3 - Update query. The result set obtained from the running the query is incorrect. The bug is a sneaky one!! Please see the attached screenshot.

The inner MAX(market_date) subquery illegally references vi, which is not in scope inside that subquery. vi is only defined in the outer subquery. vi does not exist in the scope of the inner SELECT max(...). So, the reference vi.product_id is invalid. To fix the bug, you will have to replace vi.product_id with product_id at line 272.