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Define the terms i) Key attribute ii) Value set
Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Such an attribute is known as a key attribute.
Value set: Each easy attribute of an entity type is associated with a value set that states the set of values that might be assigned to that attribute for every individual entity.
Q. State the Technique for converting a state diagram to code. i) Identify the major control path. Starting with first state, find the path from diagram that corresponds
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
Views in relational algebra: 1. Basic expression contains either a) A relation in the database. b) A constant relation. 2. General expressions are madde out of sma
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
Extend your CREATE TABLE statement from problem 3 with referential integrity constraints. Updates and deletes on related rows are restricted. 6. From examination of the sample data
what are information system hirarchy?
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
Drawbacks of Database systems ?
Natural Join : It is the similar like Equi join except one of the duplicate columns is removed in the result table. The natural join is the most usually used form of join operation
User error : This contains errors in the program (e.g., Logical errors) with errors made by online users of database. These types of errors can be avoided by applying some check
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