SQL Operators

Duration: 5 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Aptitude: Number System, Percentage, Profit and Loss, Ratio and Proportion (Ratios), Average, Time and Work, Speed Time and Distance, Simple Interest and Compound Interest, Mixture and Alligation, Data Interpretation, Permutation and Combination, Probability, Logarithm, Powers and Exponents (Surds and Indices), Age Problems, Divisibility Rules, Partnership, HCF LCM, Algebra, Pipe and Cistern
  2. Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Analogy, Coding Decoding, Blood Relations, Directions (Direction Test), Syllogisms, Logical Sequence Of Words, Data Sufficiency, Seating Arrangements, Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement
  3. English Language: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Vocabulary, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Active Passive Voice (Voice), Direct and Indirect Speech, Cloze Test (Cloze Passage), Tenses, Subject Verb Agreement (Verb Noun Agreement), Preposition, Articles, Conjunction, Adverb
  4. Written English Test: English Writing Ability
  5. Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  6. Communication Round: Communication Assessment
  7. DBMS (Technical Interview): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Big Data Systems, NoSQL, Data Warehousing & Mining
  8. SQL (Technical Interview): SQL
  9. Operating Systems (Technical Interview): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  10. Computer Networks (Technical 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
  11. OOPs (Technical Interview): Object Oriented Programming (OOPS)
  12. HR Interview: MR & HR Interview Preparation
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video provides a comprehensive overview of SQL operators, covering arithmetic, comparison, logical, and set/concatenation operators, along with their precedence and handling of NULL values. The instructor systematically explains each operator type with examples, emphasizing their role in building complex queries. The lesson concludes with a clear precedence table to guide proper expression evaluation.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces SQL operators as fundamental building blocks for data manipulation, filtering, and calculation. The video begins by defining the core categories: arithmetic operators (+, -, *, /, %) for mathematical operations, and comparison operators (=, !=, <, >, <=, >=, BETWEEN, LIKE, IN, IS NULL) for filtering data based on value comparisons.

  2. 2:00 – 5:00 02:00-05:00

    The lesson progresses to logical operators (AND, OR, NOT) for combining multiple conditions, followed by set and concatenation operators (||, UNION, INTERSECT, EXCEPT) for combining or comparing result sets. The instructor visually demonstrates operator precedence with a table, explaining that operators on the same precedence level are evaluated left to right, with parentheses having the highest priority.

  3. 5:00 – 5:05 05:00-05:05

    The video transitions to a critical discussion on NULL handling in SQL. The instructor explains that NULL represents missing or unknown data and cannot be compared using standard operators like = or !=. Instead, specific NULL operators (IS NULL, IS NOT NULL) must be used to test for the absence of a value.

The video systematically teaches SQL operators by category, from basic arithmetic and comparison to logical and set operations, concluding with essential rules for handling NULL values. This structured approach equips learners with the foundational knowledge to construct accurate and complex SQL queries.

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