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A collection of a same kind of entities is known as an Entity Set or entity type.
Example:
For the COLLEGE database defines earlier objects of concern are Students, Faculty, Course and departments. The sets of all the students' entities form a entity set STUDENT. Likewise collection of all the courses creates an entity set COURSE.
Entity sets require not be disjoint. For example - an entity may be part of the entity set STUDENT, the entity set FACULTY, and the entity set PERSON.
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
What is it ?
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
Three Level Architecture of DBMS or Logical DBMS Architecture The logical architecture defines how data in the database is perceived by users. It is not deals with how the da
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
exercise solution
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how to implement hyrise in C plus plus
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