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Consider the subsequent relations along with keys underlined
Street (name, location, city) House (number, street_name) Lives (name, house_number) Define the above relations as tables in SQL making real world assumptions about the kind of the fields. Define the primary keys and the foreign keys.
Create table street (name character(30) primary key, location character(30), city character(30)); Create table house( number integer primary key, street_name character(30) references street(name)); Create table lives ( name character(30) primary key, house number integer references house(number));
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Name the metrics for selecting top algorithm There are a number of metrics for selecting top algorithm: i) Computational complexity: Computational complexity refers to eff
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s
a publishing company produce scientific books on various subjects. the books are written by authors who specialize in one particular subject. the company employs editors who, not n
1. Staff(staffID, firstName, lastName, availabilityID, experience, phone, mobile, email); 2. Availability(availabilityID, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday,
Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than
er diagram on cosmetics.
Define average latency time. The average latency time of the disk is one-half the time for a full rotation of the disk.
What are called jukebox systems? Jukebox systems have a few drives and numerous disks that can be loaded into single of the drives automatically.
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