Write the following queries in relational algebra Customer (sid, name, career) Commodity(cid, title) Price (sid, cid, HKD) Details: • Sid of Price is a foreign key referring to sid of Customer. • Cid of Price is a foreign key referring to cid of Commodity. 1. Find the sid of customers who have boughtboth the commodityentitled “milk” and the commodity entitled “bread”. 2. Find the sid of customers who have bought the commodity entitled “milk” or the commodity entitled “hamburger”. 3. Find the sid and names of customers who did not buythe commodity entitled “milk”.

Q: Consider the insurance database of Figure 3.17, where the primary keys areunderlined. Construct the…

A: A primary key is a column that exists in a table or is created by the database in a specific order.…

Q: Consider the relational database of Figure 3.19. Give an expression in SQL for each of the…

A: a. Modify the database so that the employee whose ID is '12345' now lives in “Newtown”. Answer:…

Q: Suppose you have the following relational DB. You may assume that no future instances of  the…

A: πEname(σYOB>1981 AND Sex=M(Employee))

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Q: Question # 1: Consider the relational database of Figure 1. Write SQL Queries for each of below…

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Q: Explain in detail the relational model with a suitable example.

A: To Do: Explain in detail the relational model with a suitable example.

Q: Consider the employee database of Figure 3.19, where the primary keys areunderlined. Give an…

A: ID and name of each employee who earns more than the average salary of all employees of her or his…

Q: Consider the relational database of Figure 3.19. Give an expression in SQL foreach of the following:…

A: Give all managers of First Bank Corporation a 10-percent raise unless the salary becomes greater…

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Q: Given relations P and Q, both over attributes A and B, write a query in relational algebra under bag…

A: Q is always contained in the answer to P.

Q: Part 2: Use the following relations to answer question 4. RO R1 a b b 2 3 4 7 1 2 2 1 2 1 2 3 1 2 4.…

A: a) is join  b) Projection give attributes and union give without duplicates .

Q: Part 2: Use the following relations to answer question 4. RO R1 a C C 1 2 2 1 2 12 2 4 7 1 2 For…

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Q: Specify

A: Here are the SQL queries as asked:   1. List the department managers who are controlling more than 2…

Q: Q1) Consider the employees database , where the primary keys are underlined. Give an expression in…

A: 1- select * from Employee where address='baghdad' and ministry_name='foriegn affairs' and…

Q: Consider the following database and its schema and write relational algebra expression to retrieve:…

A: The relational algebra expression to retrieve the ids of suppliers who supply red chains and their…

Q: a) consider the employee database . What are the appropriate primary keys? b) Consider the employee…

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Q: Consider the employee database of Figure 3.19, where the primary keys areunderlined. Give an…

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Q: Consider the following schema for STUDENT- Student (RollNo, Name, City, Father-Name, Branch, Sem,…

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Q: onvert the following SQL Query  to Relational Algebra : 1. Select customer.phone, customer.address,…

A:

Q: Consider the employee database of Figure 2.17. Give an expression in the relational algebra to…

A: Relational algebra The relational algebra in a database comprises a set of operations that accepts…

Q: Consider the employee database of Figure 3.19, where the primary keys areunderlined. Give an…

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Q: Write the following queries in relational algebra Creature (name, category, status) FoodChain…

A: To understand the problem, lets construct the table:

Q: Consider the bank database of Figure 15.14, where the primary keys are underlined, and the following…

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Q: Consider the relational database of Figure 3.19, where the primary keys areunderlined. Give an…

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Q: Consider the insurance database of Figure 3.17, where the primary keys areunderlined. Construct the…

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Q: Given the EER diagram above, map it to an equivalent relational model by using the steps in Chapter…

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Q: Suppose you have the following relational DB. You may assume that no future instances of  the…

A: 1)Select Ename from Employee       Where (YOB>1981 And Sex='M');

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Q: Consider the relational database of Figure 3.20. Give an expression in SQL for each of the following…

A: Modify the database so that Jones now lives in Newtown Answer: update employee set city = 'Newtown'…

Q: Consider the bank database of Figure 2.18. Give an expression in the relational algebra for each of…

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A: Doing with MySQL query

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A: Actually, database is a used to stores the data.

Q: Consider the relational database of Figure 3.19. Give an expression in SQL foreach of the following:…

A: We use the 'update' query to modify the database. We use the 'set' query to set the city to…

Q: Consider the library database of Figure 3.20. Write the following queries in SQL.Find the average…

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Q: Consider the following relation. Instructor (ID , name, dept – name, salary) Department (dept – name…

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Q: Consider the given bank database. Compose SQL Queries for each of below scenarios.…

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Q: Consider the relational database of Figure 3.19, where the primary keys areunderlined. Give an…

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Q: Write the following queries in relational algebra Customer (sid, name, career) Commodity(cid,…

A: Objective: Given three table schema  Customer (sid, name, career) Commodity(cid, title) Price (sid,…

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Q: Consider the employee database of Figure 2.17. Give an expression in the relational algebra to…

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A: use of cross and count function in relation algebra

Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.