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Let us now talk about the relational operations:
SELECT
The select operation is used to select few specific record from the database based on different criteria, This is a unary operation mathematically denoted as σ
Syntax:
σ (Relation)
The Boolean expression is specified in is made of a number of clauses of the form:
or
Comparison operators in the set { ≤, ≥, ≠, =, <, <} apply to the attributes whose domains are ordered value like as integer.
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Attributes and its types explain?
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multiplicity constarin
Define the notation for classes and atrributes The notation for class, attribute, and operations are shown below: Figure: Class with attributes and operations A
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