please answer the two questions under the second image. Also please include how you knew it was the foreign and primary key ### Simplified Relational Schema for a Video Rental PlaceThis schema describes a database for managing a video rental establishment, comprising six distinct relations:1. **VideoRack** - Attributes: `(rackId, rackName)`2. **Video** - Attributes: `(videoId, videoName, rackId, genreID)`3. **Staff** - Attributes: `(staffId, staffName, rackID)`4. **CheckOut** - Attributes: `(videoId, checkoutDate, staffId, rentalDays)`5. **VideoGenre** - Attributes: `(genreID, genreName)`6. **Director** - Attributes: `(directorID, directorName, rackId)`### Explanation- **VideoRack**: Represents the storage units for videos, identified by `rackId` and labeled with `rackName`.- **Video**: Contains information about each video, including its unique `videoId`, name, location (`rackId`), and genre (`genreID`).- **Staff**: Details of the employees, identified by `staffId`, and including a reference to the rack they are responsible for.- **CheckOut**: Keeps track of video rentals, specifying which video was rented (`videoId`), the date of rental, the staff member responsible, and the number of days rented.- **VideoGenre**: Defines the genres available, each with a unique `genreID` and name.- **Director**: Lists directors and associates them with videos using `rackId`.This schema allows efficient management of video inventory, staff responsibilities, and rental transactions in the video rental place. The following conditions are satisfied:- Every Video rack has exactly one unique id and one name.- All movies of the same movie director are placed in a single rack. However, the video rental place may not stock movies of all directors.- Every video has a unique id and one name, but different videos may have the same name.- Every staff has an id and a name. There is no restriction on Staff’s name though.- A rack can store many videos, but each video is only placed on one rack.- A staff is responsible for one rack, and one rack is maintained by one or more staff.- One video can be checked out only once a day. A staff has to checkout the video.- A genre will have many Videos but each video belongs to just 1 genre.Questionsi. (7pts) What is the primary key for each of the relations VideoRack, Video, Staff, CheckOut, VideoGenre, and Director?ii. (13 pts) What are the foreign key(s) for the relations VideoRack, Video, Staff, CheckOut, VideoGenre, and Director?

Primary key is unique and it is used to uniquely identify a row. Foreign Key does not have its own…

Answered: please answer the two questions under…

please answer the two questions under the second image. Also please include how you knew it was the foreign and primary key

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

please answer the two questions under the second image. Also please include how you knew it was the foreign and primary key

### Simplified Relational Schema for a Video Rental Place

This schema describes a database for managing a video rental establishment, comprising six distinct relations:

1. **VideoRack**
- Attributes: `(rackId, rackName)`

2. **Video**
- Attributes: `(videoId, videoName, rackId, genreID)`

3. **Staff**
- Attributes: `(staffId, staffName, rackID)`

4. **CheckOut**
- Attributes: `(videoId, checkoutDate, staffId, rentalDays)`

5. **VideoGenre**
- Attributes: `(genreID, genreName)`

6. **Director**
- Attributes: `(directorID, directorName, rackId)`

### Explanation

- **VideoRack**: Represents the storage units for videos, identified by `rackId` and labeled with `rackName`.
- **Video**: Contains information about each video, including its unique `videoId`, name, location (`rackId`), and genre (`genreID`).
- **Staff**: Details of the employees, identified by `staffId`, and including a reference to the rack they are responsible for.
- **CheckOut**: Keeps track of video rentals, specifying which video was rented (`videoId`), the date of rental, the staff member responsible, and the number of days rented.
- **VideoGenre**: Defines the genres available, each with a unique `genreID` and name.
- **Director**: Lists directors and associates them with videos using `rackId`.

This schema allows efficient management of video inventory, staff responsibilities, and rental transactions in the video rental place.

The following conditions are satisfied:

- Every Video rack has exactly one unique id and one name.
- All movies of the same movie director are placed in a single rack. However, the video rental place may not stock movies of all directors.
- Every video has a unique id and one name, but different videos may have the same name.
- Every staff has an id and a name. There is no restriction on Staff’s name though.
- A rack can store many videos, but each video is only placed on one rack.
- A staff is responsible for one rack, and one rack is maintained by one or more staff.
- One video can be checked out only once a day. A staff has to checkout the video.
- A genre will have many Videos but each video belongs to just 1 genre.

Questions

i. (7pts) What is the primary key for each of the relations VideoRack, Video, Staff, CheckOut, VideoGenre, and Director?

ii. (13 pts) What are the foreign key(s) for the relations VideoRack, Video, Staff, CheckOut, VideoGenre, and Director?

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