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Selection Operator (σ) is a unary operator in relational algebra that performs a selection operation.
It selects those rows or tuples from the relation that satisfies the selection condition.
DBMS Notes:
File 1: https://drive.google.com/file/d/14bXNQ8BRqYj_F5Q0h9kjCu5dBV_-Yc3h/view?usp=sharing
File 2: https://drive.google.com/file/d/1O4KdWod2jd3ja5kK62Fskqst-Wkz80R4/view?usp=sharing
Contributed by: Anurag Singhal
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48 Comments
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Projection is like
System.out.println(abc);
printf(abc);
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Anna from pakistan
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The videos for dbms are too helpful, I am revising all of it for Interview Preparation.
For the above example, does σ roll no = 2 ( π name, roll ( Student ) ) work?
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Hello sir, how to type these sigam operator in software?? How to execute these examples??
Thanks
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sir pai sql me type kese karte h
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