ASSIGNMENT-2 SQL

[afesobi]

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

What did you learn from the changes you have made?

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

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

How were these changes tested?

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

Checklist

• I can confirm that my changes are working as intended

[kelichiu]

Total Point: 63/70

Section 1: 40/46

• Date table is missing its relationships with other tables with dates (Order, and Employee_Shift as well)
• Order Table is actually the orders of new books from suppliers to refill the stock, not customer orders. Having relationship with Sales is incorrect.
• Relationships between tables are not indicated (one-to-one, one-to-many, or many-to-many)

Section 2: 7/8

• WINDOW FUNCTION Q1: When use ROW_NUMBER, the data of customer_id and market_date is not unique. We need to use GROUP BY to get the unique combination of customer_id and market_date in data.

Section 3: 8/8

Section 4: 8/8