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What is Cross Product?
Simply Cross product is Binary Operator
What are the disadvantages of file-processing system? Ans: The Disadvantages of File-Processing System a. Data redundancy and inconsistency - Data redundancy means not nece
Define reference file
What is meant by computing the closure of a set of functional dependency? The closure of F denoted by F + is the set of functional dependencies logically implied by F.
Explain group By clause in SQL? Group By clause in SQL: The GROUP BY clause can be used in a SELECT statement to collect data across multiple records and group the results thro
What are composite attributes? Composite attributes can be separated in to sub parts.
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
Critically explained the benefits and limitations of different database technologies with proper examples
Define weak and strong entity sets? Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets. Strong entity set: Entity set that
About Attribute inheritance
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