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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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Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
Explain the Relational Completeness Codd described the term relational completeness to consider to a language that is complete with respect to first-order predicate calculus ex
Determine the minimal set of functional dependencies for the following data. This table is part of the OHSU database of extracurricular activities and tracks the DMICE band's co
A relation instance indicates as r is a collection of tuples for a given relational schema at a exact point of time. A relation state r of the relation schema R (A 1 ,A 2 ,.....
coventions for displaying an ER schema as ER diagram
Question: (a) With the help of a diagram, explain the TOGAF framework for enterprise architectures. (b) Where would you position enterprise architectures in an enterpri
he SQL query that will return the order number, quantity ordered, price each and total cost of an order (quantity * price each) from the order details table. Label the calculated c
When every condition appears with equality condition (=) only. c) Natural join (denoted by R*S) When two join attributes have the similar name in both relations. (Tha
Attributes having a one value for a particular entity. For instance, Age is a single valued attribute of a student entity. Attributes that have more than single values
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