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Problem 1. Please create the following tables for a tool rental database with appropriate primary keys & foreign keys. [50 points]

Assumptions:

1. Each tool belongs to a category.
2. Each category may have a parent category but the parent category should not have parent category (so at most two levels). E.g., a Tool A belongs to electric mower, and electric mower belongs to mower. Mower has no parent category.
3. Each tool can be rented at different time units. The typical time units are hourly, daily, and weekly. There is a different price for each time unit and tool combination. E.g., tool A may be rented at $5 per hour, $30 per day, and $120 per week.
4. Each customer can rent a tool for a certain number of time units. If the tool is returned late a late fee will be charged.

The list of tables is:

Tables:

Cust Table:

cid, -- customer id

cname, --- customer name

cphone, --- customer phone

cemail, --- customer email

Category table:

ctid, --- category id

ctname, --- category name

parent, --- parent category id since category has a hierarchy structure, power washers, electric power washers, gas power washers. You can assume that there are only two levels.

Tool:

tid, --- tool id

tname, --- tool name

ctid, --- category id, the bottom level.

quantity, --- number of this tools

Time_unit table allowed renting unit

tuid, --- time unit id

len, --- length of period, can be 1 hour, 1 day, etc.

min_len, --- minimal #of time unit, e.g., hourly rental but minimal 4 hours.

Tool_Price:

tid, --- tool id

tuid, --- time unit id

price, -- price per period

Rental:

rid, --- rental id

cid, --- customer id

tid, --- tool id

tuid, --- time unit id

num_unit, --- number of time unit of rental, e.g., if num_unit = 5 and unit is hourly, it means 5 hours.

start_time, -- rental start time

end_time, --- suppose rental end_time

return_time, --- time to return the tool

credit_card, --- credit card number

total, --- total charge

Problem 2. Insert at least three rows of data to each table. Make sure you keep the primary key and foreign key constraints.