Practice Questions Functional Dependency

Duration: 2 min

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Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension/Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Vocabulary, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Subject Verb Agreement (Verb Noun Agreement), Tenses, Verb, Articles, Preposition, Conjunction, Pronoun, Noun, Adjectives, Adverb, Modals, Cloze Test (Cloze Passage), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  2. Logical Ability: Coding Decoding, Directions (Direction Test), Analogy, Inequality, Data Sufficiency, Series (Number and Letter Series) (Numerical Relations and Reasoning), Syllogisms, Seating Arrangements, Puzzle Solving (Puzzles), Blood Relations, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Ranking, Order and Sequence, Logical Sequence Of Words, Data Arrangement, Venn Diagram, Calendar, Clock
  3. Quantitative Ability: Logarithm, Permutation and Combination, Probability, Profit and Loss, Speed Time and Distance, Mixture and Alligation, Partnership, Simple Interest and Compound Interest, Percentage, Ratio and Proportion (Ratios), Average, Time and Work, Pipe and Cistern, Number System, Divisibility Rules, HCF LCM, Algebra, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Age Problems, Data Interpretation, Sequence and Series (Series)
  4. Basic Analytical Ability: Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Selection Decision Table (Decision Making)
  5. Computer Programming: Pseudo Codes, Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  6. DBMS (Computer Science): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Concurrency Control, Database Security & Authorization
  7. SQL (Computer Science): SQL
  8. OS (Computer Science): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Process Synchronization, Threads & Process Creation, Memory Management, Virtual Memory, File Management
  9. Computer Networks (Computer Science): 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
  10. Data Structures (Computer Science): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. OOPs (Computer Science): Object Oriented Programming (OOPS)
  12. Software Engineering (Computer Science): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  13. SVAR Conversational - Spoken English: Communication Assessment
  14. 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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