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What are the two integrity rules?
Ans: The two integrity rules are: Entity Integrity Rule & Referential Integrity Rule.
Entity Integrity Rule - If the attribute A of relation R is a major attribute of R then A cannot agree to take null values.
Referential Integrity Rule - In referential integrity, it is make sure that a value that appears in one relation for a given set of attributes as well appears for a particular set of attributes in another relation.
What is Gathering information and Producing ERD Gathering information: This could be a written document that explains the system in question with reasonable quantity of detai
crete a data base relationship model Entity: Students; Professors; Dormitories buildings; Attributes of students: Name; Address; Dorm;
QUESTION (a) Consider a car database consisting of car model, car make, car origin, Engine capacity, color, cost.
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
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What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
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Inconsistent Analysis : The problem as given with transactions T1 and T2 where two transactions interleave to make incorrect result during an analysis by Audit is the instance of s
Describe the definition of a transaction in SQL Ans: The SQL transaction starts implicitly. Transactions are finished by either Commit work that commits the transaction and st
State about the Activity Diagram Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results
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