Outer Join

Duration: 3 min

This video lesson is available to enrolled students.

Return to /learn/RSSB-SENIOR-COMPUTER-INSTRUCTOR/paper-2-database-management-system/relational-algebra/join-operations-inner-outer/asset-outer-join after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper-2 | Fundamentals of Computer: Basics of COA, Number System, Floating Point Rep, Number Representation
  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  16. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, 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, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: Child Development, Concept of Pedagogy, Psychology, Theories, Inclusive Education, Experiential Pedagogy, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  24. Live Sessions: RSSB Live Sessions
  25. RSSB Paper 1 - Full Mock Tests:
  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces outer join operations as an extension to standard joins for handling missing information in relational databases. The instructor explains that outer joins preserve tuples that would otherwise be lost by filling unmatched attributes with null values. Three specific forms are defined: left outer join (⋉⊟), right outer join (⊟⋊), and full outer join. The lesson progresses from theoretical definitions to practical construction of result tables using sample relations R1 and R2. The instructor demonstrates how to populate columns A, B, and C by matching tuples based on common attributes. For unmatched rows in the left relation during a left outer join, null values are padded to maintain tuple integrity. Similarly, right and full outer joins ensure all tuples from the respective relations are included in the final result.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins by defining outer join operations as an extension to handle missing information, explicitly stating on screen that the operation 'preserves those tuples that would be lost in a join by creating tuples in the result containing null values.' The instructor lists three forms: left outer join (⋉⊟), right outer join (⊟⋊), and full outer join. Moving into the first example, the slide displays 'Left Outer Join' with relations R1 containing tuples (A,B) as (1,P), (2,Q), and (3,R). The instructor starts constructing the result table by writing headers A, B, C and copying values from R1 to demonstrate how unmatched rows are handled.

  2. 2:00 – 3:27 02:00-03:27

    The lecture continues by defining Right Outer Join, noting on screen it 'takes all tuples in the right relation that did not match with any tuple in the left.' The instructor demonstrates constructing the result table for R1 ⋈ R2, showing how to pad tuples with null values. The concept of Full Outer Join is then introduced, defined as doing 'both the left and right outer join operations.' The instructor manually writes out the resulting table for R1 ⋈ R2, visually showing how unmatched tuples from both relations are included with null padding to form the complete joined relation.

The core pedagogical progression moves from abstract definition to concrete application. The instructor establishes that outer joins solve the problem of data loss in standard joins by introducing null padding. This is operationalized through three distinct variations: left, right, and full outer joins. The visual evidence shows a consistent method of table construction where the instructor first lists input relations R1 and R2, then builds a result schema. For left outer joins, the focus is on preserving all rows from R1 even if they lack matches in R2. For right outer joins, the preservation extends to R2. The full outer join combines both strategies. The notation ⋉⊟, ⊟⋊, and the combined symbol are explicitly used to distinguish these operations in relational algebra. The repeated use of relations R1 and R2 with specific values (1,P), (2,Q), (3,R) provides a consistent dataset for comparing the outcomes of different join types.

Loading lesson…