Day 3 | DBMS in Hindi | Attributes & Keys Explained | Candidate, Primary, Super Key | BPSC TRE 4.0
Автор: Codingly
Загружено: 2026-01-21
Просмотров: 28
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Welcome to Day 3 of the DBMS Full Course (Hindi).
In this session, we cover one of the most important and frequently asked topics from DBMS —
ER Model: Types of Attributes and Keys, explained with clear examples and exam logic.
This lecture is extremely useful for:
BPSC TRE
STET / CTET
KVS
DSSSB
UGC NET (DBMS Basics)
Computer Science Students & Beginners
📚 Topics Covered in Day 3:
🔹 Types of Attributes
Single Valued & Multivalued Attribute
Simple & Composite Attribute
Stored & Derived Attribute
Key & Non-Key Attribute
Complex Attribute
Required Attribute
Optional Attribute
🔹 Keys in DBMS
What is a Key?
Candidate Key (Simple & Composite)
Primary Key
Alternate Key
Super Key
Prime & Non-Prime Attributes
Relationship between Primary, Candidate & Super Key
🔹 Important Concepts
Codd Rules (Related to Keys)
Minimum Super Key concept
Numerical problems on:
Number of Super Keys
Exam-oriented examples & logic
🎯 Why This Video is Important?
ER Model & Keys are high-weightage topics
Frequently asked in objective & theory exams
Concepts explained in simple Hindi + English
Helps in solving MCQs & numericals confidently
📌 Upcoming in Next Class:
ER Diagram Symbols
Entity Types
Relationship Types
Cardinality & Participation
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