Practice Questions Functional Dependency

Duration: 2 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Ability: Speed Mathematics and Basic Mathematics, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Speed Time and Distance, Number System, HCF LCM, Data Interpretation, Age Problems, Mixture and Alligation, Partnership, Algebra, Sequence and Series (Series), Mensuration and Geometry, Arithmetic
  2. Reasoning Ability: Puzzle Solving (Puzzles), Seating Arrangements, Coding Decoding, Blood Relations, Directions (Direction Test), Syllogisms, Data Sufficiency, Ranking, Order and Sequence, Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Data Arrangement, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning)
  3. Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Vocabulary, Sentence Completion (Fill in the blanks), Active Passive Voice (Voice), Direct and Indirect Speech, Subject Verb Agreement (Verb Noun Agreement), Tenses, Preposition, Articles, Sentence Correction (Error Correction)
  4. Programming Basics (MCQs + Interview): C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  5. OOPs (MCQs + Interview): Object Oriented Programming (OOPS)
  6. DBMS (MCQs + Interview): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Decomposition Properties & 4NF, Concurrency Control, Database Recovery, File Organization & Indexing, Relational Algebra, Database Security & Authorization
  7. SQL (MCQs + Interview): SQL
  8. Operating Systems (MCQs + Interview): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Process Synchronization, Disc Scheduling, File Management, Security
  9. Computer Networks (MCQs + Interview): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
  10. Coding: Coding Questions by Yash Sir
  11. HR Interview: MR & HR Interview Preparation
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video teaches verifying functional dependencies using relation instances. The instructor works through three examples, guiding viewers to inspect tuples for validity. The first example uses attributes A, B, and C to test single-attribute dependencies. The second uses X, Y, and Z for composite and single dependencies. The final example asks students to identify the single invalid dependency among four choices for a table with five attributes, reinforcing the concept of uniqueness.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by displaying a relation instance with columns A, B, and C containing five tuples. He systematically evaluates a list of functional dependencies: A->B, B->C, B->A, C->B, C->A, and A->C. He places checkmarks and crosses next to each option to indicate validity. Subsequently, he transitions to a new problem involving a relation with columns X, Y, and Z. He analyzes dependencies including XZ->X, XY->Z, Z->Y, Y->Z, and XZ->Y. He marks XZ->X and XY->Z as valid, while crossing out Z->Y (where Z=3 maps to Y=4,5,6) and XZ->Y (where X=1, Z=3 maps to Y=4,5).

  2. 2:00 – 2:07 02:00-02:07

    The video concludes with a multiple-choice question asking to identify the dependency that does not hold good for a relation with columns A, B, C, D, and E. The options are A->BC, DE->C, C->DE, and BC->A. The instructor verifies the validity of the first, second, and fourth options, marking them with checks. He identifies C->DE as the invalid dependency because the value '3' in column C corresponds to different values in columns D and E (specifically D=4,6 and E=5,6), and marks it with an X.

The lecture effectively bridges theoretical concepts of functional dependencies with practical data inspection. By walking through concrete examples, the instructor demonstrates that a dependency X->Y holds only if every unique value of X is associated with exactly one value of Y across all tuples. The progression from simple single-attribute checks to identifying the specific invalid dependency in a complex table reinforces the logical rules of database normalization.

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