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What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
Describes the several relationship constraints through giving suitable example? Constraints on relationships: There are two kinds of constraints on relationships. 1) Mapping
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
Explain DML with some examples? DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples: • SELECT - retrieve data from the a da
Define Single Value and Multivalued attribute Single value attribute comprise a single atomic value for an entity and multivalued attribute may have much more than one value f
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
Attributes having a one value for a particular entity. For instance, Age is a single valued attribute of a student entity. Attributes that have more than single values
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