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Don't overwhelm to learn Git,🙌

Git is only this much👇😇

1.Core:
• git init
• git clone
• git add
• git commit
• git status
• git diff
• git checkout
• git reset
• git log
• git show
• git tag
• git push
• git pull

2.Branching:
• git branch
• git checkout -b
• git merge
• git rebase
• git branch --set-upstream-to
• git branch --unset-upstream
• git cherry-pick

3.Merging:
• git merge
• git rebase

4.Stashing:
• git stash
• git stash pop
• git stash list
• git stash apply
• git stash drop

5.Remotes:
• git remote
• git remote add
• git remote remove
• git fetch
• git pull
• git push
• git clone --mirror

6.Configuration:
• git config
• git global config
• git reset config

7. Plumbing:
• git cat-file
• git checkout-index
• git commit-tree
• git diff-tree
• git for-each-ref
• git hash-object
• git ls-files
• git ls-remote
• git merge-tree
• git read-tree
• git rev-parse
• git show-branch
• git show-ref
• git symbolic-ref
• git tag --list
• git update-ref

8.Porcelain:
• git blame
• git bisect
• git checkout
• git commit
• git diff
• git fetch
• git grep
• git log
• git merge
• git push
• git rebase
• git reset
• git show
• git tag

9.Alias:
• git config --global alias.<alias> <command>

10.Hook:
• git config --local core.hooksPath <path>

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SQL INTERVIEW PREPARATION

Explain the differences between DELETE, TRUNCATE, and DROP commands in SQL.

Answer:

These three SQL commands are used to remove data from a database, but they operate in different ways and serve different purposes.

DELETE:
- Purpose: Removes specific rows from a table based on a condition.
- Usage: Can delete all rows or a subset of rows from a table.
- Syntax:

  DELETE FROM table_name WHERE condition;
  

- Example:

  DELETE FROM employees WHERE department_id = 10;
  

- Characteristics:
- Can use WHERE clause to filter which rows to delete.
- Generates row-level locks.
- Deletes one row at a time, which can be slower for large tables.
- Can be rolled back if used within a transaction.
- Triggers, if defined, will be fired.

TRUNCATE:
- Purpose: Removes all rows from a table, resetting it to its empty state.
- Usage: Used when you need to quickly remove all data from a table.
- Syntax:

  TRUNCATE TABLE table_name;
  

- Example:

  TRUNCATE TABLE employees;
  

- Characteristics:
- Cannot use WHERE clause.
- Faster than DELETE as it deallocates the data pages instead of row-by-row deletion.
- Resets any AUTO_INCREMENT counters.
- Cannot be rolled back in some database systems as it is a DDL operation.
- Does not fire triggers.

DROP:
- Purpose: Removes an entire table or database from the database.
- Usage: Used when you need to completely remove a table or database structure.
- Syntax:

  DROP TABLE table_name;
  DROP DATABASE database_name;
  

- Example:

  DROP TABLE employees;
  

- Characteristics:
- Permanently deletes the table or database and all its data.
- Cannot be rolled back; once dropped, the table or database is gone.
- All indexes and triggers associated with the table are also deleted.
- Removes table definition and data.

Tip: Use DELETE when you need to remove specific rows and want the option to roll back the transaction. Use TRUNCATE when you need to quickly clear all data from a table without deleting the table structure itself. Use DROP when you need to completely remove a table or database structure and all associated data permanently. Always ensure you have backups and understand the impact of these operations before executing them.

Like this post if you want me to continue this SQL series 👍♥️

Hope it helps :)

𝐏𝐚𝐲 𝐀𝐟𝐭𝐞𝐫 𝐏𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐓𝐫𝐚𝐢𝐧𝐢𝐧𝐠 - 𝐋𝐞𝐚𝐫𝐧 𝐂𝐨𝐝𝐢𝐧𝐠 𝐅𝐫𝐨𝐦 𝐒𝐜𝐫𝐚𝐭𝐜𝐡 😍

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2: Basic front-end:
a. Html
b. Css
c. Javascript
Expected time 7+14+30=51 days.
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a. Learn css framework ( Bootstrap , Tailwind css , ...)
b. Learn JavaScript frameworks ( angular, react , vue...)

Expected time minimum 60 days.
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a. MySQL
b. MongoDB
There are many more. Choose one and learn.
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a. Php
b. Nodejs
There are many more. Learn any one.

Expected time: 60 days
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Java Roadmap
|
|-- Fundamentals
| |-- Basics of Programming
| | |-- Introduction to Java
| | |-- Java Development Kit (JDK) and Java Runtime Environment (JRE)
| | |-- Setting Up Development Environment (IDE: IntelliJ IDEA, Eclipse, etc.)
| |
| |-- Syntax and Structure
| | |-- Basic Syntax
| | |-- Variables and Data Types
| | |-- Operators and Expressions
|
|-- Control Structures
| |-- Conditional Statements
| | |-- If-Else Statements
| | |-- Switch Case
| |
| |-- Loops
| | |-- For Loop
| | |-- While Loop
| | |-- Do-While Loop
| |
| |-- Exception Handling
| | |-- Try-Catch Block
| | |-- Finally Block
| | |-- Throw and Throws Keywords
|
|-- Object-Oriented Programming (OOP)
| |-- Basics of OOP
| | |-- Classes and Objects
| | |-- Methods and Constructors
| |
| |-- Inheritance
| | |-- Single and Multiple Inheritance
| | |-- Method Overriding
| | |-- Super Keyword
| |
| |-- Polymorphism
| | |-- Method Overloading
| | |-- Runtime Polymorphism
| | |-- Dynamic Method Dispatch
| |
| |-- Encapsulation
| | |-- Access Modifiers (Public, Private, Protected)
| | |-- Getters and Setters
| | |-- Data Hiding
| |
| |-- Abstraction
| | |-- Abstract Classes
| | |-- Interfaces
|
|-- Advanced Java
| |-- Collections Framework
| | |-- List (ArrayList, LinkedList)
| | |-- Set (HashSet, TreeSet)
| | |-- Map (HashMap, TreeMap)
| | |-- Queue (PriorityQueue, LinkedList)
| |
| |-- Concurrency
| | |-- Multithreading (Creating Threads, Thread Lifecycle)
| | |-- Synchronization
| | |-- Concurrency Utilities (Executors Framework, Callable and Future, Locks and Semaphores)
|
|-- Java Standard Libraries
| |-- I/O Streams
| | |-- File Handling (File Class, Reading and Writing Files)
| | |-- Streams (Byte Streams, Character Streams, Buffered Streams)
| |
| |-- Networking
| | |-- Sockets (TCP and UDP, Socket and ServerSocket Classes)
| | |-- URL and HTTP (URL Class, HttpURLConnection)
| |
| |-- JDBC
| | |-- Database Connectivity (JDBC Drivers, Connection, Statement, and ResultSet)
| | |-- PreparedStatement and CallableStatement
|
|-- Java Frameworks
| |-- Spring Framework
| | |-- Spring Core (Dependency Injection, Inversion of Control)
| | |-- Spring MVC (Model-View-Controller Architecture)
| | |-- Spring Boot (Creating Spring Boot Applications, Starters and Auto-Configuration, Actuator)
| |
| |-- Hibernate
| | |-- ORM Basics (Introduction to ORM, Configuration and Mapping)
| | |-- Advanced Hibernate (Caching, Transactions and Concurrency, Criteria API)
|
|-- Web Development with Java
| |-- Java EE (Jakarta EE)
| | |-- Servlets (Lifecycle, Handling HTTP Requests and Responses, Session Management)
| | |-- JavaServer Pages (JSP) (Syntax, Directives, JSTL and Custom Tags, Expression Language)
| |
| |-- RESTful Web Services
| | |-- JAX-RS (Creating RESTful Services, Annotations and HTTP Methods, Consuming RESTful Services)
|
|-- Build Tools and Dependency Management
| |-- Maven
| | |-- Project Object Model (POM), Dependencies, Repositories, Build Lifecycle and Plugins
| |
| |-- Gradle
| | |-- Build Scripts, Dependency Management, Task Automation
|
|-- Testing in Java
| |-- Unit Testing
| | |-- JUnit (Annotations, Assertions, Test Suites and Runners)
| |
| |-- Mockito (Creating Mocks and Spies and Verification)
| |
| |-- Integration Testing
| | |-- Spring Test (Testing Spring Components and WebTestClient)
|
|-- Deployment and DevOps
| |-- Containers and Microservices
| | |-- Docker (Dockerfile, Image Creation, Container Management)
| | |-- Kubernetes (Pods, Services, Deployments, Managing Java Applications on Kubernetes)

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Here are 20 essential VS Code shortcuts for beginners:

1. Ctrl + P: Open any file quickly 📂

2. Ctrl + /: Toggle line comment 📝

3. Alt + Up/Down: Move a line up or down ↕️

4. Ctrl + Shift + K: Delete the current line ❌

5. Ctrl + B: Show/hide the sidebar 📚

6. Ctrl + Space: Trigger IntelliSense for code suggestions 💡

7. Ctrl + Shift + F: Search across files 🔍

8. Ctrl + D: Select the next occurrence of the selected text 📑

9. Ctrl + Shift + L: Select all occurrences of the current selection 🔗

10. Ctrl + Shift + P: Open the Command Palette 📜

11. Ctrl + F2: Rename all occurrences of a variable ✏️

12. Ctrl + J: Show/hide the integrated terminal 💻

13. Ctrl + `: Open a new terminal 🔧

14. Ctrl + Shift + N: Open a new window 🖼️

15. Ctrl + W: Close the current editor tab 🗂️

16. Ctrl + Shift + E: Focus on the file explorer 🗃️

17. Ctrl + Shift + G: Open the Git view 🔄

18. Ctrl + Shift + M: Open the Problems panel 🚨

19. Alt + Shift + Up/Down: Copy the line up or down 📋

20. Ctrl + Alt + Arrow keys: Split the editor window ✂️


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𝟮. 𝗣𝘆𝘁𝗵𝗼𝗻 𝗣𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗰𝗼𝘂𝗿𝘀𝗲
Learn the fundamentals like functions, loops, conditional statements, etc of the most important language for data science.
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𝟯. 𝗣𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗘𝘀𝘀𝗲𝗻𝘁𝗶𝗮𝗹𝘀 𝗶𝗻 𝗣𝘆𝘁𝗵𝗼𝗻
Part 1 prepares you for PCEP – Certified Entry-Level Python Programmer Certification.
Part 2 prepares you for PCAP – Certified Associate in Python Programming Certification.
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𝟰. Python Data Structure and Algorithms
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𝟱. 𝗦𝗰𝗶𝗲𝗻𝘁𝗶𝗳𝗶𝗰 𝗖𝗼𝗺𝗽𝘂𝘁𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗣𝘆𝘁𝗵𝗼𝗻
You'll learn Python fundamentals like variables, loops, conditionals, and functions.
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You'll learn how to read data from sources like CSVs and SQL, and how to use libraries like Numpy, Pandas, Matplotlib, and Seaborn to process and visualize data.
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𝟳. 𝗗𝗮𝘁𝗮 𝗩𝗶𝘀𝘂𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝘄𝗶𝘁𝗵 𝗣𝘆𝘁𝗵𝗼𝗻
You will learn how to implement the graphical representation of data in order to interactively and efficiently convey insights to clients, customers, and stakeholders in general.
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𝟴. 𝗠𝗮𝗰𝗵𝗶𝗻𝗲 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗣𝘆𝘁𝗵𝗼𝗻
You will build several neural networks and explore more advanced techniques like natural language processing and reinforcement learning.
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9. Practice Python
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10. Free Python course by datacamp
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Here’s the complete list of 100 JavaScript interview questions:

1. What is JavaScript?
2. What are the data types in JavaScript?
3. What is the difference between null and undefined?
4. Explain the concept of hoisting in JavaScript.
5. What is a closure in JavaScript?
6. What is the difference between “==” and “===” operators in JavaScript?
7. Explain the concept of prototypal inheritance in JavaScript.
8. What are the different ways to define a function in JavaScript?
9. How does event delegation work in JavaScript?
10. What is the purpose of the “this” keyword in JavaScript?
11. What are the different ways to create objects in JavaScript?
12. Explain the concept of callback functions in JavaScript.
13. What is event bubbling and event capturing in JavaScript?
14. What is the purpose of the “bind” method in JavaScript?
15. Explain the concept of AJAX in JavaScript.
16. What is the “typeof” operator used for?
17. How does JavaScript handle errors and exceptions?
18. Explain the concept of event-driven programming in JavaScript.
19. What is the purpose of the “async” and “await” keywords in JavaScript?
20. What is the difference between a deep copy and a shallow copy in JavaScript?
21. How does JavaScript handle memory management?
22. Explain the concept of the event loop in JavaScript.
23. What is the purpose of the “map” method in JavaScript?
24. What is a promise in JavaScript?
25. How do you handle errors in promises?
26. Explain the concept of currying in JavaScript.
27. What is the purpose of the “reduce” method in JavaScript?
28. What is the difference between “null” and “undefined” in JavaScript?
29. What are the different types of loops in JavaScript?
30. What is the difference between “let,” “const,” and “var” in JavaScript?
31. Explain the concept of event propagation in JavaScript.
32. What are the different ways to manipulate the DOM in JavaScript?
33. What is the purpose of the “localStorage” and “sessionStorage” objects?
34. How do you handle asynchronous operations in JavaScript?
35. What is the purpose of the “forEach” method in JavaScript?
36. What are the differences between “let” and “var” in JavaScript?
37. Explain the concept of memoization in JavaScript.
38. What is the purpose of the “splice” method in JavaScript arrays?
39. What is a generator function in JavaScript?
40. How does JavaScript handle variable scoping?
41. What is the purpose of the “split” method in JavaScript?
42. What is the difference between a deep clone and a shallow clone of an object?
43. Explain the concept of the event delegation pattern.
44. What are the differences between JavaScript’s “null” and “undefined”?
45. What is the purpose of the “arguments” object in JavaScript?
46. What are the different ways to define methods in JavaScript objects?
47. Explain the concept of memoization and its benefits.
48. What is the difference between “slice” and “splice” in JavaScript arrays?
49. What is the purpose of the “apply” and “call” methods in JavaScript?
50. Explain the concept of the event loop in JavaScript and how it handles asynchronous operations.
51. What are arrow functions, and how are they different from regular functions?
52. What is the purpose of the “filter” method in JavaScript?
53. Explain the concept of destructuring in JavaScript.
54. What is a callback hell, and how can it be avoided?
55. What are “promises,” and how do they work in JavaScript?
56. Explain the difference between synchronous and asynchronous JavaScript.
57. What is JSON, and how is it used in JavaScript?
58. How can you remove duplicates from an array in JavaScript?
59. What is the purpose of the “includes” method in JavaScript?
60. How do you handle default values in JavaScript functions?
61. What are template literals, and how are they used?
62. Explain the concept of modules in JavaScript.
63. What is CORS, and why is it important?
64. What is the “fetch” API, and how does it work?
65. Explain the concept of immutability in JavaScript.
66. What is the purpose of the “find” method in JavaScript arrays?
67.

How does “import” and “export” work in JavaScript?
68. What is a Proxy object in JavaScript?
69. Explain the difference between “var,” “let,” and “const” scope.
70. How do you flatten an array in JavaScript?
71. What are IIFE (Immediately Invoked Function Expressions)?
72. What is the purpose of the “setTimeout” and “setInterval” functions?
73. Explain the concept of polyfills in JavaScript.
74. What is a WeakMap in JavaScript, and how is it different from a Map?
75. How do you handle data binding in JavaScript?
76. What is the purpose of the “every” and “some” methods in JavaScript arrays?
77. Explain the difference between “==” and “===” in JavaScript.
78. How do you remove properties from an object in JavaScript?
79. What is the purpose of the “Object.freeze” method?
80. How do you check if an object is empty in JavaScript?
81. Explain the concept of throttling in JavaScript.
82. What is a WeakSet in JavaScript?
83. How does JavaScript’s garbage collection work?
84. What is debouncing in JavaScript, and how is it different from throttling?
85. What is the purpose of the “Object.assign” method?
86. Explain the difference between map, filter, and reduce.
87. How do you handle inheritance in JavaScript?
88. What is the difference between synchronous and asynchronous functions?
89. How does the “async” keyword work with functions?
90. What are JavaScript decorators?
91. Explain how to optimize JavaScript code for performance.
92. What is a service worker in JavaScript?
93. How do you use “try...catch” for error handling in JavaScript?
94. Explain how promises can be chained.
95. What are the benefits of using closures in JavaScript?
96. How can you reverse a string in JavaScript?
97. What is a Set in JavaScript?
98. Explain the concept of promises with async/await.
99. How do you use “Object.keys,” “Object.values,” and “Object.entries” in JavaScript?
100. What is the purpose of “Promise.all” in JavaScript?

This list provides a comprehensive overview of JavaScript concepts, making it useful for interview preparation.

Join @coderslearning for more! ✅

ENJOY LEARNING 👍👍