Database Systems please help me answer this question I will give you a good rating Thank you! ### Question 2: Relational Model / Relational Algebra#### Consider the following schema:```plaintextSailors(sid: integer, sname: string, rating: integer, age: real);Boats(bid: integer, bname: string, color: string);Reserves(sid: integer, bid: integer, day: date);```#### Symbols you may need:\[\cap \quad \cup \quad \sigma \quad \pi \quad \bowtie \quad \rho\]You should use anything that we covered in the slides.1. **Find the names of sailors who reserved a blue boat, have a rating of at least 8, and are older than 40.**2. **Find the names of sailors who reserved only blue boats.**3. **Find the names of sailors who reserved at least two boats.** - *Similar to our example of “Find the students who earned at least two A’s”*4. **Find the names of sailors who reserved exactly two boats.** - *The solution could be based on the previous question*5. **Given the following two records, will Tom and Peter be included in the resulting table of Q2-1 (Question 2 subquestion 1)? Show the reasons.**#### Data:- **Sailors:** - `123, Tom, NULL, NULL` - `124, Peter, NULL, 41` - **Boats:** - `1, ABC, Blue` - **Reserves:** - `123, 1, 10/19/2020` - `124, 1, 10/20/2020`#### Explanation:- **Problem 1:** - This question asks to filter sailors who match specific criteria based on boat color, rating, and age. You will likely need to join the Sailors and Reserves tables, and then filter based on the criteria.- **Problem 2:** - This focuses on finding sailors who reserved only blue boats. A combination of joins and difference operations will be useful here.- **Problem 3:** - This involves finding sailors who reserved at least two boats, requiring you to count the occurrences per sailor.- **Problem 4:** - It requires identifying sailors who have reserved exactly two boats, by counting and filtering based

1) Find the name of the sailor who reserved a blue boat having a rating at least 8 and older than 40…

Question 2: Relational Model / Relational Algebra Consider the following schema, Sailors(sid: integer, sname: string, rating: integer, age: real); Boats(bid: integer, bname: string, color: string); Reserves(sid: integer, bid: integer, day: date). Symbols you may need: n --U -- ở -- TI -- A -P You use anything that we covered in the slides. 1. Find the names of sailors who reserved a blue boat, have rating at least 8 and older than 40. 2. Find the names of sailors who reserved only blue boats. 3. Find the names of sailors who reserved at least two boats. (Similar to our example of "Find the students who earned at least two As")

Question 2: Relational Model / Relational Algebra Consider the following schema, Sailors(sid: integer, sname: string, rating: integer, age: real); Boats(bid: integer, bname: string, color: string); Reserves(sid: integer, bid: integer, day: date). Symbols you may need: n --U -- ở -- TI -- A -P You use anything that we covered in the slides. 1. Find the names of sailors who reserved a blue boat, have rating at least 8 and older than 40. 2. Find the names of sailors who reserved only blue boats. 3. Find the names of sailors who reserved at least two boats. (Similar to our example of "Find the students who earned at least two As")

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

See similar textbooks

Similar questions

Design and build a Database Management system on Microsoft Access according to the specifications. (0) Address book to list Customers, Suppliers, Staff, etd
Describe how any company's information systems use databases.
How does the SQL ORDER BY clause work, and why might it be important when using database functions like MAX() or MIN()? Provide a query illustrating its usage.
Find out how online databases may be used for many purposes such as the government, entertainment, travel, commerce, research, and educational purposes.
How safe is the information stored in your database? In what methods can you ensure the safety of your database?
Explain how an organization utilizes databases in its information systems, particularly with reference to a specific organization.
It's not safe to put your personal information into a database. How often, if ever, are you allowed to request and get hard copies of your data records from each database? Concerned about protecting your privacy while online?
Locate your databases. How often can each database print your data record? Data privacy concerns?
Explain how you use databases or databases-related applications. Consider using databases in work, school, or on social media. Should you include two database uses in your discussion post?
large scale database