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What is an ERD?
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
A domain is a set of permissible values that can be given to an attribute. So each attribute in a table has a definite domain. Values to these attributes cannot be assigned outside
Vertical Fragmentation- Vertical fragmentation groups together only those attributes in a relation that are used jointly by various important transactions. A vertical fragment is d
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
What are the DBMS languages? Explain. Ans: a) Data Definition Languages (DDL): It is employed to specify database schema for example CREATE DROP statements etc. b) Dat
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
WHAT IS DATABASE TECHNOLOGIES
Q. What is relational algebra and calculus? Explain the relational algebra operators :- Selection and predicate, set operation, joins and division. Sol. Relational Algebra
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