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Strong entity set and weak entity set?
Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key. A weak entity set has no primary key unless attributes of the strong entity set on that it depends are involved. Tuples in a weak entity set are partitioned according to their relationship along with tuples within a strong entity set. Tuples within each partition are distinguishable through a discriminator that is a set of attributes. A strong entity set has a primary key. All tuples in the set are distinguishable through that key. A weak entity set has no primary key unless attributes of the strong entity set on that it depends are included. Tuples in a weak entity set are partitioned according to their relationship along with tuples in a strong entity set. Tuples within every partition are distinguishable through a discriminator, which is a set of attributes.
Draw an EER diagram that captures the "is-a" hierarchy of students in another simple database. The database captures both the "basic" information (say, student ID and student name)
Explain the difference between using functions along with and without grouping attributes in relational algebra. Give examples. Ans: Group functions are used to group data of
While using extract datasets it is required to have a special workarea for interface False. It is not required to have a special workarea for interface
sir, could anybody help me in getting complete information about the mentioned topic
Multilevel Index The Multilevel Index is a modification of the secondary level index system. In this system we might be use even more number of levels in case the table is eve
Problem : AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
a project based on normalization with first, second and third normalization. There need to be a diagram also
Attributes and its types explain?
Define Sequence A sequence is a set of integers 1, 2, 3 that are generated in order on demand. Sequences are regularly used in databases because lots of applications require ev
Your OS has a set of queues, each of which is protected by a lock. To enqueue or dequeue an item, a thread must hold the lock associated to the queue. You need to implement an a
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