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Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner)
Answer the following queries in relational algebra(i) Find out the names and address of hotels in Agra.(ii) List the names of cities that have no hotel.(iii) List the names of the hotels owned through ‘Taj Group'.
Ans: (i) Π name, address ( σ city_name= ‘Agra' (Hotelname=city_name City_hotel))(ii) Π city_name (City) - Π city_name(City_hotel)(iii) Π hotel_name ( σ owner='Taj Group' (City_hotel))
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Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner) Answer the following queries in relational algebra (i) Find
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
Express the subsequent query in SQL assumes which the data is stored within EMPLOYEE table with relevant fields (i) Display name, job, salary, and hire date of employee who are
Define a table in SQL known as Client that is used to store information about the clients. Define CLIENT_NO as the primary key whose first letter must begin with ‘C'. Also ensure t
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what is inverted and multilist structure
Question: a) There are three concurrency problems, i.e. three types of potential mistake which could occur if concurrency control is not properly enforced in the database syst
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