Date & Time Functions

Duration: 3 min

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Module outline

  1. Discrete Mathematics: Permutation, Combination and Probability / क्रमचय, संचय एवं प्रायिकता, Set Theory, Relations, Functions, Propositional and Predicate Logic, Graph Theory, Group Theory
  2. Digital Logic: Digital Systems & Boolean Basics, Boolean Expression, Boolean Minimization, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  3. Computer Organization and Architecture: Basics of COA, Programming the Basic Computer, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design, Pipelining, Multiprocessors
  4. Programming: Language Design, C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++
  5. Data Structures: Introduction to DS, Array, Linked List, Stack, Queue, Tree, Graphs, Hashing
  6. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  7. Theory of Computation: Grammar, Regular Language Properties, Moore & Mealy Machines, Turing Machines
  8. Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment, Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Pushdown Automata & CFG, Complexity Theory
  9. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS, Security
  10. Database Management Systems: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, ORDBMS, NoSQL
  11. Computer Networks: 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
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video lecture introduces SQL date and time functions, focusing on capturing system time, extracting date parts, and performing calendar-based calculations. The instructor systematically explains core functions like CURRENT_DATE, CURRENT_TIMESTAMP, and EXTRACT, providing syntax and examples for each. The lesson then transitions to advanced operations such as DATEADD for modifying dates and DATEDIFF for calculating intervals between dates, concluding with validation and date part extraction functions.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by introducing the fundamental date and time functions in SQL. The lesson covers how to capture the current system date using CURRENT_DATE or CURDATE, and the current system date and time using CURRENT_TIMESTAMP or NOW. Examples are provided for each, showing the output format. The instructor then explains the EXTRACT function, which allows users to pull out specific parts of a date, such as the year, month, or day, and demonstrates its syntax with examples. The segment concludes with an introduction to the shorthand functions YEAR, MONTH, and DAY, which return these date parts as integers.

  2. 2:00 – 2:41 02:00-02:41

    The video transitions to advanced date operations. The instructor introduces DATEADD, which allows adding or subtracting a specific time interval (like days, months, or years) from a given date, with an example showing how to add 5 days to a date. Next, the lesson covers DATEDIFF, which calculates the difference in intervals (e.g., days) between two dates. The instructor also explains EOMONTH, which returns the last day of the month for a given date, and ISDATE, which validates whether a given string is a valid date. The segment concludes with the DATENAME function, which returns a string representation of a date part, such as the month name.

The lesson progresses logically from basic date capture and extraction to more complex date manipulation and validation. It equips learners with a foundational understanding of SQL date functions, enabling them to handle date-related queries in databases effectively.

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