[TeamOptimist]

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

Handle missing values (null), count customer visits, extract product descriptions, and identify the market dates with the highest and lowest sales. I also created a product_units table to practice inserting, deleting, and updating records.

What did you learn from the changes you have made?

How to use COALESCE to handle missing values and window functions to calculate rankings and counts while keeping each row visible

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

NA

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

I added the current_quantity column more than once. I addressed these by checking table names and running queries in the correct order.

How were these changes tested?

I used SELECT statements to check the contents of product_units and compared the updated quantities with records in vendor_inventory.

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

NA

Checklist

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

[github-actions]

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