Desc & Show Tables

Duration: 3 min

This video lesson is available to enrolled students.

Return to /learn/DSSSB-TGT-COMPUTER-SCIENCE-PAPER-2/data-base-management-system/sql/ddl-dml-dcl-tcl-desc/asset-desc-show-tables after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Programming, Data Structures, OOP & Java: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Java Fundamentals, Array, String, IO & References, Language Design, Intro to Compilers, Visual Basics, Syntax Analysis: Bottom-Up, Object Oriented Technology
  3. Computer Networks, TCP/IP & Network Security: Introduction to CN, Data Communication, DLL: Flow Control, DLL: Access Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Access Technologies, Network Security, Society, Law & Ethics, Cloud Computing, Mobile Computing, Net Layer:Routing Protocol, Cyber Safety and Security
  4. Teaching Methodology: Child Development, Concept of Pedagogy, Theories, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Curriculum Framework & Reforms, National Education Policy (NEP) 2020, Psychology, Teaching-Learning Process, Personality Development, Teaching Methods & Strategies, Learning and Motivation, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Nature, Objectives & Characteristics of Teaching, Teaching-Learning Aids & ICT Integration, Classroom Management & Communication, Evaluation, Assessment & Measurement, Curriculum & School Environment, Inclusive Education & Special Needs, Professional Development & Ethics
  5. Digital Electronics / Boolean Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Analog-Digital Conversion
  6. Operating Systems & Linux: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, File Management, Disc Scheduling, Unix OS, Linux OS, Distributed Systems, Windows OS
  7. Data Base Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, File Organization & Indexing, Transaction Management, Concurrency Control, Database Security & Authorization, Database Recovery, Data Warehousing & Mining
  8. Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, HTML Basics, CSS, Emerging Technologies, JavaScript-Basics, .Net Programming, Electronic Data Interchange and E-Commerce, XML
  9. Computer Fundamentals, IT Basics & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer, Terms & Abbreviations, MS Office Applications, Instr Formats & Modes, Floating Point Rep, Artificial Intelligence, साइबर सुरक्षा / Cyber Safety and Security, कंप्यूटर सॉफ़्टवेयर / Computer Software, ऑपरेटिंग सिस्टम / Operating System, वर्ड प्रोसेसिंग (MS Word) / Word Processing (MS Word), कंप्यूटर नेटवर्क / Computer Networks
  10. Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  11. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, extras, Fundamentals of Systems and Information Systems
  12. Design & Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  13. Mathematics - I, II, III, IV: Permutation and Combination, Logarithm, Linear Algebra, Algebra, Calculus, Trigonometry, Vectors, Set Theory, Functions, Relations, Propositional and Predicate Logic, Research Process Steps, Graph Theory, Number System & Place Value, Factors, Multiples, Divisibility, HCF & LCM, Mensuration — Perimeter, Area, Surface Area, Volume, Data Handling, Graphs & Probability, Coordinates & Graphs, Higher Mathematics — Trigonometry, Quadratics, Polynomials, Progressions, Statistics, Logarithms, समतल क्षेत्रमिति / Plane Mensuration, प्रतिचयन / Sampling
  14. Computer Graphics, Multimedia & Mobile Computing: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing, Multimedia
  15. Emerging Trends: Emerging Tech Trends, Knowledge Representation, Natural Language Processing
  16. Statistical Techniques: Probability, Statistics
  17. Interpolation - DI: Data Interpretation
  18. Basis of Physics: Physics
  19. Previous Year Paper:
  20. Business Studies and Management: Business Communication, Business Organization and Management, Financial Accounting, Business Economics, Management Information System (MIS), Knowledge Management & New Economy
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video is a lecture on SQL commands for database management, focusing on the DESCRIBE and SHOW TABLES commands. The first segment explains the DESCRIBE command, which acts as an 'X-ray' to inspect a table's structure. It details the command's syntax, `DESCRIBE table_name;`, and shows an example output for a 'Student' table, breaking down the columns: Field (column name), Type (data type), Null (whether NULL values are allowed), Key (indexing/primary key info), Default (default value), and Extra (additional info). The lecture also compares it to other commands: `SHOW TABLES` lists all tables in a database, and `SELECT * FROM table` displays the actual data. The second segment transitions to the SHOW TABLES command, explaining that in RDBMS like Oracle, it is not a direct command but is implemented using system views. It presents a table comparing three purposes: listing personal tables, accessible tables, and system-wide tables, each with its corresponding SQL query using `SELECT table_name FROM` and the appropriate system view (e.g., `user_tables`, `all_tables`, `dba_tables`). The lecturer emphasizes that Oracle uses these views instead of a direct SHOW TABLES command, unlike MySQL.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a slide titled 'DESCRIBE Command'. The lecturer explains that this command is used to check a table's column names, data types, and constraints before writing complex queries. The syntax is shown as `DESCRIBE table_name;`. An example output for a 'Student' table is displayed, showing columns for Field, Type, Null, Key, Default, and Extra. The lecturer explains what each column reveals: Field is the column name, Type is the data type (e.g., int, varchar), Null indicates if the column allows NULL values, Key identifies indexing or primary key information (e.g., PRI for Primary Key), and Default shows the default value if none is provided. The slide also includes a table comparing the DESCRIBE command with SHOW TABLES and SELECT * FROM commands, outlining their purposes and what they display.

  2. 2:00 – 3:16 02:00-03:16

    The video transitions to a new slide titled 'Show Tables Command'. The lecturer explains that in RDBMS like Oracle, the SHOW TABLES operation is not a direct command but is implemented using system views. The slide presents a table with three purposes: listing Personal Tables, Accessible Tables, and System-Wide (DBA) tables. For each purpose, it provides the syntax pattern (`SELECT table_name FROM`), the actual command (e.g., `SELECT table_name FROM user_tables;`), and what it shows. The lecturer explains that `user_tables` shows only tables created by the user, `all_tables` shows tables the user has access to, and `dba_tables` shows every table in the database, requiring DBA privileges. The lecturer uses a red pen to circle and emphasize key parts of the text and code on the slide.

The lecture progresses from a fundamental command for inspecting table structure (DESCRIBE) to a command for listing tables (SHOW TABLES), highlighting a key difference in implementation between database systems. It teaches that DESCRIBE provides a detailed blueprint of a single table, while SHOW TABLES provides a list of tables. The core synthesis is that while MySQL has a direct SHOW TABLES command, Oracle uses system views like `user_tables`, `all_tables`, and `dba_tables` to achieve the same result, with the scope of the list determined by the user's privileges. This demonstrates the importance of understanding the specific syntax and system architecture of the RDBMS being used.

Loading lesson…