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Discuss the count function?
The COUNT function used returns the number of tuples or values fixed in a query.
The count function comprises two types of syntax: (1) COUNT (*) - returns the number of rows in the result query, (2) COUNT ([DISTINCT] ) - in this means, the NULL values are discarded and if employed then the duplicates are as well discarded in the count.
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Define Partial Key and Primary Key A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar o
explain normalization,and give the examples 1NF,2NF,3NF,BCNF.AND FUNCTIONAL DEPANDENACY AND DECOMPOSITION TECHNIQUES.
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
A relationship set is a set of relationships of the similar type. For example, let consider the relationship among two entities sets course and student. Collection of all the in
Define two-phase locking protocol. Ans: Two-phase locking is significance in the context of ensuring that schedules are serializable. The two-phase locking protocol defines a p
vertical fragmentation
Question 1: a) What is the difference between a non-impact and impact printer? b) Which type of printer is generally used in a supermarket to print your receipt? Describe
What are domain constraints? A domain is a set of values that might be assigned to an attribute .all values that appear in a column of a relation must be taken fro
Can we delete data element, which is being used by table fields. No we cant delete data element.
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