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Define an operator that a Relational Algebra does not have
Ans: Relational Algebra does not have Aggregation operators.
Example: //REVOKE ALL ON EMP FROM MCA12; (All permissions will be cancelled) You can also cancel only some of the permissions. Drop: A user-
What is a view? A view is a logical view on one or more tables. A view on one or more tables i.e., the data from a view is not actually physically kept instead being derived f
What is Cross Product? Simply Cross product is Binary Operator
explain equi-join using illustration
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
explain external view
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
What is Identity? Identity (or AutoNumber) is a column that automatically produces numeric values. A start and increment value can be set, but most DBA leave these at 1. A GUID
Identify the need and use of data control through problem solving, illustration
Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
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