Question $1$

Create a complete ERD in Crow's Foot notation that can be implemented in the relational model using the following

description of operations. Hot Water $($HW$)$ is a small start$-$up company that sells spas. HW does not carry any stock. A few

spas are set up in a simple warehouse so customers can see some of the models available, but any products sold must be

ordered at the time of the sale.

HW can get spas from several different manufacturers.

Each manufacturer produces one or more different brands of spas.

Each and every brand is produced by only one manufacturer.

Every brand has one or more models.

Every model is produced as part of a brand. For example, Iguana Bay Spas is a manufacturer that produces Big Blue lguana

spas, a premium$-$level brand, and Lazy Lizard spas, an entry$-$level brand. The Big Blue lguana brand offers several models,

including the BBI$-6,$ an $81-$jet spa with two $6-$hp motors, and the BBI$-10,$ a $102-$jet spa with three $6-$hp motors.

Every manufacturer is identified by a manufacturer code. The company name, address, area code, phone number, and

account number are kept in the system for every manufacture

For each brand, the brand name and brand level $($premium$,$ mid$-$level, or entry$-$level$)$ are kept in the system.

For each model, the model number, number of jets, number of motors, number of horsepower per motor, suggested retail

price, HW retail price, dry weight, water capacity, and seating capacity must be kept in the system.

Your ERD needs to fulfill the following requirements:

Your ERD needs to fulfill the following requirements:

Convert $M$:$N$ relationship, if any, into two $1$:$M$ relationships through a composite entity.

Specify all appropriate Relationship Participation $($optional or mandatory$).$

Specify all appropriate connectivities $(1$:$1,1$:$M,$ or $M$:$N$ relationship$).$

Specify the primary key and foreign key$($s$)($if applicable$)$ for each entity.

Name and list $1-3$ major attributes other than the primary key and the foreign key$($s$)($if applicable$)$ for each entity.

If you need to make any assumptions, please mention them.

The ERD will be created using the online drawing tools I mentioned in the syllabus or any other tools you prefer. Please

refer to Module $3\mathrm{.}8$ How to draw an ERD in

draw.io for reference.