Unit - 5 - Lecture 1 Introduction to Query Processing

Introduction to Query Processing
Relational query processing refers to the range of activities which includes in extracting data from a database using a database query.
A query processing involves below steps.
(1)Scan
(2)Parse
(3)Validate
[1] Scan
The scanner reads the language token such as SQL keywords, relation names in the text of the query.
[2] Parse
The parser check the query syntax to verify it is as per the syntax rules of the query language.

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