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๐ Eager to land a high-paying tech role or pivot into IT? Don't miss the FREE demo by Nxtwave!
๐ Over 1700 companies have onboarded our students, including industry giants like Google, Nvidia, Samsung, and Infosys.
๐ฅ Acquire crucial tech skills, benefit from real-time doubt resolution, and stand a chance to secure a Rs 22,000 scholarship!
๐ Who can join? Graduates from 2016 to 2024.
๐ฃ Languages offered: English, Hindi, Tamil, Telugu, Marathi, Kannada, and more.
Hurry, limited seats available!
Register now: https://bit.ly/Coders_learning
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Complete Roadmap to learn SQL
๐๐
Step 1: Basics of SQL
1. Learn SQL syntax, keywords, and basic commands (SELECT, FROM, WHERE).
2. Practice querying data from a single table.
3. Understand data types, NULL values, and basic functions (COUNT, SUM, AVG).
4. Experiment with simple filtering and sorting.
Step 2: Intermediate SQL
1. Dive deeper into SQL with JOIN operations (INNER JOIN, LEFT JOIN, RIGHT JOIN).
2. Learn about subqueries and correlated subqueries.
3. Practice using aggregate functions (GROUP BY, HAVING) for data summarization.
4. Explore table creation, modification, and deletion commands (CREATE, ALTER, DROP).
Step 3: Advanced SQL
1. Master advanced SQL concepts such as window functions and common table
expressions (CTEs).
2. Learn about indexing and optimization techniques for query performance.
3. Practice writing complex queries involving multiple joins and subqueries.
4. Explore advanced topics like stored procedures, triggers, and transactions.
Join @coderslearning for more โ
Share this post if you need more! โค๏ธ
Hope it helps :)
๐๐
Step 1: Basics of SQL
1. Learn SQL syntax, keywords, and basic commands (SELECT, FROM, WHERE).
2. Practice querying data from a single table.
3. Understand data types, NULL values, and basic functions (COUNT, SUM, AVG).
4. Experiment with simple filtering and sorting.
Step 2: Intermediate SQL
1. Dive deeper into SQL with JOIN operations (INNER JOIN, LEFT JOIN, RIGHT JOIN).
2. Learn about subqueries and correlated subqueries.
3. Practice using aggregate functions (GROUP BY, HAVING) for data summarization.
4. Explore table creation, modification, and deletion commands (CREATE, ALTER, DROP).
Step 3: Advanced SQL
1. Master advanced SQL concepts such as window functions and common table
expressions (CTEs).
2. Learn about indexing and optimization techniques for query performance.
3. Practice writing complex queries involving multiple joins and subqueries.
4. Explore advanced topics like stored procedures, triggers, and transactions.
Join @coderslearning for more โ
Share this post if you need more! โค๏ธ
Hope it helps :)
๐ฎ๐ฌ ๐ฆ๐ค๐ ๐พ๐๐ฒ๐ฟ๐ ๐ผ๐ฝ๐๐ถ๐บ๐ถ๐๐ฎ๐๐ถ๐ผ๐ป ๐๐ฒ๐ฐ๐ต๐ป๐ถ๐พ๐๐ฒ๐
Below are the SQL query optimization techniques that I found to be significant, listed in the top 20:
1. Create an index on huge tables (>1.000.000) rows
2. Use EXIST() instead of COUNT() to find an element in the table
3. SELECT fields instead of using SELECT *
4. Avoid Subqueries in WHERE Clause
5. Avoid SELECT DISTINCT where possible
6. Use WHERE Clause instead of HAVING
7. Create joins with INNER JOIN (not WHERE)
8. Use LIMIT to sample query results
9. Use UNION ALL instead of UNION wherever possible
10. Use UNION where instead of WHERE ... or ... query.
11. Run your query during off-peak hours
12. Avoid using OR in join queries
14. Choose GROUP BY over window functions
15. Use derived and temporary tables
16. Drop the index before loading bulk data
16. Use materialized views instead of views
17. Avoid != or <> (not equal) operator
18. Minimize the number of subqueries
19. Use INNER join as little as possible when you can get the same output using LEFT/RIGHT join.
20. Frequently try to use temporary sources to retrieve the same dataset.
Join @coderslearning for more โ
Share this post if you need more!โค๏ธ
Hope it helps :)
Below are the SQL query optimization techniques that I found to be significant, listed in the top 20:
1. Create an index on huge tables (>1.000.000) rows
2. Use EXIST() instead of COUNT() to find an element in the table
3. SELECT fields instead of using SELECT *
4. Avoid Subqueries in WHERE Clause
5. Avoid SELECT DISTINCT where possible
6. Use WHERE Clause instead of HAVING
7. Create joins with INNER JOIN (not WHERE)
8. Use LIMIT to sample query results
9. Use UNION ALL instead of UNION wherever possible
10. Use UNION where instead of WHERE ... or ... query.
11. Run your query during off-peak hours
12. Avoid using OR in join queries
14. Choose GROUP BY over window functions
15. Use derived and temporary tables
16. Drop the index before loading bulk data
16. Use materialized views instead of views
17. Avoid != or <> (not equal) operator
18. Minimize the number of subqueries
19. Use INNER join as little as possible when you can get the same output using LEFT/RIGHT join.
20. Frequently try to use temporary sources to retrieve the same dataset.
Join @coderslearning for more โ
Share this post if you need more!โค๏ธ
Hope it helps :)
๐1
SQL for Data Analysis:
30 commonly asked questions in database management system (DBMS) interviews
๐๐
1. What is a DBMS?
2. Differentiate between DBMS and RDBMS.
3. What are the advantages and disadvantages of using a DBMS?
4. Explain the three levels of data abstraction in DBMS.
5. What is a database schema?
6. Define normalization and its importance in database design.
7. What are the different types of database models?
8. What is ACID (Atomicity, Consistency, Isolation, Durability) in DBMS?
9. What is a primary key, and why is it important?
10. Explain the concept of foreign keys.
11. Differentiate between a candidate key, primary key, and super key.
12. What is a transaction in a database?
13. Describe the differences between DELETE, TRUNCATE, and DROP commands.
14. What is a view in a database?
15. Explain indexing in databases.
16. What is a stored procedure?
17. What are the advantages of using stored procedures?
18. Describe the differences between clustered and non-clustered indexes.
19. What is a deadlock in DBMS?
20. How can you avoid deadlocks in a database?
21. What is data redundancy, and how can it be minimized?
22. What is a trigger in a database?
23. Describe the different types of joins in SQL.
24. What is a constraint in a database?
25. Explain the differences between a unique key and a primary key.
26. How does SQL differ from NoSQL databases?
27. What is the CAP theorem, and how does it relate to databases?
28. Explain the concept of data warehousing.
29. What are OLTP and OLAP, and how do they differ?
30. How would you approach database performance tuning and optimization?
30 commonly asked questions in database management system (DBMS) interviews
๐๐
1. What is a DBMS?
2. Differentiate between DBMS and RDBMS.
3. What are the advantages and disadvantages of using a DBMS?
4. Explain the three levels of data abstraction in DBMS.
5. What is a database schema?
6. Define normalization and its importance in database design.
7. What are the different types of database models?
8. What is ACID (Atomicity, Consistency, Isolation, Durability) in DBMS?
9. What is a primary key, and why is it important?
10. Explain the concept of foreign keys.
11. Differentiate between a candidate key, primary key, and super key.
12. What is a transaction in a database?
13. Describe the differences between DELETE, TRUNCATE, and DROP commands.
14. What is a view in a database?
15. Explain indexing in databases.
16. What is a stored procedure?
17. What are the advantages of using stored procedures?
18. Describe the differences between clustered and non-clustered indexes.
19. What is a deadlock in DBMS?
20. How can you avoid deadlocks in a database?
21. What is data redundancy, and how can it be minimized?
22. What is a trigger in a database?
23. Describe the different types of joins in SQL.
24. What is a constraint in a database?
25. Explain the differences between a unique key and a primary key.
26. How does SQL differ from NoSQL databases?
27. What is the CAP theorem, and how does it relate to databases?
28. Explain the concept of data warehousing.
29. What are OLTP and OLAP, and how do they differ?
30. How would you approach database performance tuning and optimization?
In SQL interviews, candidates are often asked about the following topics:
Basic SQL commands: Candidates may be asked to write basic SQL commands to retrieve, update, or delete data from a database.
Joins: Understanding different types of joins (e.g., inner join, outer join, left join, right join) and how to use them effectively.
Subqueries: Writing and understanding subqueries to retrieve specific data from a database.
Indexes: Understanding the purpose of indexes in a database and how they can improve query performance.
Normalization: Knowledge of database normalization and its importance in database design.
Constraints: Understanding different types of constraints (e.g., primary key, foreign key, unique constraint) and how they are used to maintain data integrity.
Aggregation functions: Knowledge of aggregation functions such as SUM, AVG, COUNT, MAX, and MIN, and how they are used in SQL queries.
Data manipulation language (DML) and data definition language (DDL): Understanding the difference between DML and DDL and being able to write queries using both.
Performance tuning: Understanding how to optimize SQL queries for better performance, including using indexes, avoiding correlated subqueries, and minimizing data retrieval.
Stored procedures and functions: Knowledge of creating and using stored procedures and functions in SQL.
These are some common topics that are often covered in SQL interviews. It's important for candidates to have a solid understanding of these concepts and be able to apply them in practical scenarios.
Join @coderslearning for more โ
Share this post if you need more!โค๏ธ
Hope it helps :)
Basic SQL commands: Candidates may be asked to write basic SQL commands to retrieve, update, or delete data from a database.
Joins: Understanding different types of joins (e.g., inner join, outer join, left join, right join) and how to use them effectively.
Subqueries: Writing and understanding subqueries to retrieve specific data from a database.
Indexes: Understanding the purpose of indexes in a database and how they can improve query performance.
Normalization: Knowledge of database normalization and its importance in database design.
Constraints: Understanding different types of constraints (e.g., primary key, foreign key, unique constraint) and how they are used to maintain data integrity.
Aggregation functions: Knowledge of aggregation functions such as SUM, AVG, COUNT, MAX, and MIN, and how they are used in SQL queries.
Data manipulation language (DML) and data definition language (DDL): Understanding the difference between DML and DDL and being able to write queries using both.
Performance tuning: Understanding how to optimize SQL queries for better performance, including using indexes, avoiding correlated subqueries, and minimizing data retrieval.
Stored procedures and functions: Knowledge of creating and using stored procedures and functions in SQL.
These are some common topics that are often covered in SQL interviews. It's important for candidates to have a solid understanding of these concepts and be able to apply them in practical scenarios.
Join @coderslearning for more โ
Share this post if you need more!โค๏ธ
Hope it helps :)
Typical Java Interview Questions sorted by experience
Junior
* Name some of the characteristics of OO programming languages
* What are the access modifiers you know? What does each one do?
* What is the difference between overriding and overloading a method in Java?
* Whatโs the difference between an Interface and an abstract class?
* Can an Interface extend another Interface?
* What does the static word mean in Java?
* Can a static method be overridden in Java?
* What is Polymorphism? What about Inheritance?
* Can a constructor be inherited?
* Do objects get passed by reference or value in Java? Elaborate on that.
* Whatโs the difference between using == and .equals on a string?
* What is the hashCode() and equals() used for?
* What does the interface Serializable do? What about Parcelable in Android?
* Why are Array and ArrayList different? When would you use each?
* Whatโs the difference between an Integer and int?
* What is a ThreadPool? Is it better than using several โsimpleโ threads?
* What the difference between local, instance and class variables?
Mid
* What is reflection?
* What is dependency injection? Can you name a few libraries? (Have you used any?)
* What are strong, soft and weak references in Java?
* What does the keyword synchronized mean?
* Can you have โmemory leaksโ on Java?
* Do you need to set references to null on Java/Android?
* What does it means to say that a String is immutable?
* What are transient and volatile modifiers?
* What is the finalize() method?
* How does the try{} finally{} works?
* What is the difference between instantiation and initialisation of an object?
* When is a static block run?
* Why are Generics are used in Java?
* Can you mention the design patterns you know? Which of those do you normally use?
* Can you mention some types of testing you know?
Senior
* How does Integer.parseInt() works?
* Do you know what is the โdouble check lockingโ problem?
* Do you know the difference between StringBuffer and StringBuilder?
* How is a StringBuilder implemented to avoid the immutable string allocation problem?
* What does Class.forName method do?
* What is Autoboxing and Unboxing?
* Whatโs the difference between an Enumeration and an Iterator?
* What is the difference between fail-fast and fail safe in Java?
* What is PermGen in Java?
* What is a Java priority queue?
* *s performance influenced by using the same number in different types: Int, Double and Float?
* What is the Java Heap?
* What is daemon thread?
* Can a dead thread be restarted?
Join @coderslearning for more โ
Enjoy Learning ๐๐
Junior
* Name some of the characteristics of OO programming languages
* What are the access modifiers you know? What does each one do?
* What is the difference between overriding and overloading a method in Java?
* Whatโs the difference between an Interface and an abstract class?
* Can an Interface extend another Interface?
* What does the static word mean in Java?
* Can a static method be overridden in Java?
* What is Polymorphism? What about Inheritance?
* Can a constructor be inherited?
* Do objects get passed by reference or value in Java? Elaborate on that.
* Whatโs the difference between using == and .equals on a string?
* What is the hashCode() and equals() used for?
* What does the interface Serializable do? What about Parcelable in Android?
* Why are Array and ArrayList different? When would you use each?
* Whatโs the difference between an Integer and int?
* What is a ThreadPool? Is it better than using several โsimpleโ threads?
* What the difference between local, instance and class variables?
Mid
* What is reflection?
* What is dependency injection? Can you name a few libraries? (Have you used any?)
* What are strong, soft and weak references in Java?
* What does the keyword synchronized mean?
* Can you have โmemory leaksโ on Java?
* Do you need to set references to null on Java/Android?
* What does it means to say that a String is immutable?
* What are transient and volatile modifiers?
* What is the finalize() method?
* How does the try{} finally{} works?
* What is the difference between instantiation and initialisation of an object?
* When is a static block run?
* Why are Generics are used in Java?
* Can you mention the design patterns you know? Which of those do you normally use?
* Can you mention some types of testing you know?
Senior
* How does Integer.parseInt() works?
* Do you know what is the โdouble check lockingโ problem?
* Do you know the difference between StringBuffer and StringBuilder?
* How is a StringBuilder implemented to avoid the immutable string allocation problem?
* What does Class.forName method do?
* What is Autoboxing and Unboxing?
* Whatโs the difference between an Enumeration and an Iterator?
* What is the difference between fail-fast and fail safe in Java?
* What is PermGen in Java?
* What is a Java priority queue?
* *s performance influenced by using the same number in different types: Int, Double and Float?
* What is the Java Heap?
* What is daemon thread?
* Can a dead thread be restarted?
Join @coderslearning for more โ
Enjoy Learning ๐๐
100+ Practice Questions
โ C/C++
โ Python
โ JavaScript
โ Java
โ C#
โ Golang
โ Simple Numbers
โ Find a digit at a specific place in a number
โ Find count of digits in a number
โ Find the largest digit
โ Find the 2nd largest digit
โ Find the kth largest digit
โ Find the smallest digit
โ Find the 2nd smallest digit
โ Find the kth smallest digit
โ Find generic root (sum of all digits) of a number
โ Reverse the digits in a number
โโ Rotate the digits in a number
โโ Is the number a palindrome?
โโ Find sum of 'n' numbers
โโ Check if a number is perfect square
โโ Find a number in an AP sequence
โโ Find a number in a GP sequence
โโ Find a number in fibonacci sequence
โโ Check number divisibility by 2, 3, 5, 9
โโ Check if a number is primary or not
20. Given a number, print all primes smaller than it
โโ Check if a number is circular prime or not
โโ Find all prime factors of a number
โโ Find the GCD of 2 numbers
โโ Find the LCM of 2 numbers
โโ Find the factorial of a number
โโ Find the exponentiation of a number
โ Unit Conversion
โ Number Base (Binary, Octal, Hexadecimal, Decimal)
โ Weight (gram, kg, pound)
โ Height (cm, m, inch, feet)
โ Temperature (centigrade, fahrenhite)
โ Distance (km, mile)
โ Area (mยฒ, kmยฒ, acre)
โ Volume (ltr, gallon)
โ Time (sec, min, hour)
โ Currency
โ Calculator
โ Loan EMI Calculator
โ Fixed Deposit Returns Calculator
โ Interest Calculator
โ BMI Calculator
โ Item Price (considering tax, discount, shipping)
โ Tip Calculator
โ Geometry
โ Find distance between 2 points
โ Given 2 sides of a right angle triangle, find the 3rd
โ Find 3rd angle of a triangle when 2 are given
โ Area of a triangle when 3 sides are given
โ Area of a right angle triangle
โ Perimeter of a Square
โ Area of a Square
โ Perimeter of a Rectangle
โ Area of a Rectangle
โ Circumference of a Circle
โโ Area of a Circle
โโ Circumference of a Semi-Circle
โโ Area of a Semi-Circle
โโ Area of a Ring
โโ Circumference of an Ellipse
โโ Area of an Ellipse
โโ Suface Area of a Sphere
โโ Volume of a Sphere
โโ Surface Area of a Hemisphere
20. Volume of a Hemisphere
โโ Surface area of a Cube
โโ Volume of a Cube
โโ Surface area of a Cylinder
โโ Volume of a Cylinder
โ Vector
โ Find Scalar Multiplication of a vector
โ Find addition/subtraction of vectors
โ Find magnitude of a vector
โ Find an unit vector along a given vector
โ Find dot product of 2 vectors
โ Find cross product of 2 vectors
โ Check if 2 vectors are orthogonal
โ Matrix
โ Find the determinant of a matrix
โ Find Scalar Multiplication of a matrix
โ Find addition/subtraction of matrices
โ Find the transpose of a matrix
โ Find if 2 matrices are orthogonal
โ Find inverse of a 2x2 and 3x3 matrix
โ Set
โ Find Union of 2 sets
โ Find Intersection of 2 sets
โ Find the Difference of 2 sets
โ Find the Symmetric Difference of 2 sets
โ Find if a set is subset/superset of another set
โ Find if 2 sets are disjoints
โ Special Numbers
โ Strong Number
โ Perfect Number
โ Armstrong Number
โ Harshad Number
โ Kaprekar Number
โ Lychrel Number
โ Narcissistic Decimal Number
โ Lucus Number
โ Catalan Number
โ Duck Number
โโ Ugly Number
โโ Abundant Number
โโ Deficient Number
โโ Automorphic Number
โโ Magic Number
โโ Friendly Pair Numbers
โโ Neon Number
โโ Spy Number
โโ Happy Number
20. Sunny Number
โโ Disarium Number
โโ Pronic Number
โโ Trimorphic Number
โโ Evil Number
โโ Amicable Pairs
๐ฅ Last Words
โฌ If you want to excel in programming, practice a lot.
โฌ Problems based on numbers are easy to start with and they help in improving your analytical skills.
Join @coderslearning for more โ
Share with your friends! ๐
Happy Learning! ๐๐
โ C/C++
โ Python
โ JavaScript
โ Java
โ C#
โ Golang
โ Simple Numbers
โ Find a digit at a specific place in a number
โ Find count of digits in a number
โ Find the largest digit
โ Find the 2nd largest digit
โ Find the kth largest digit
โ Find the smallest digit
โ Find the 2nd smallest digit
โ Find the kth smallest digit
โ Find generic root (sum of all digits) of a number
โ Reverse the digits in a number
โโ Rotate the digits in a number
โโ Is the number a palindrome?
โโ Find sum of 'n' numbers
โโ Check if a number is perfect square
โโ Find a number in an AP sequence
โโ Find a number in a GP sequence
โโ Find a number in fibonacci sequence
โโ Check number divisibility by 2, 3, 5, 9
โโ Check if a number is primary or not
20. Given a number, print all primes smaller than it
โโ Check if a number is circular prime or not
โโ Find all prime factors of a number
โโ Find the GCD of 2 numbers
โโ Find the LCM of 2 numbers
โโ Find the factorial of a number
โโ Find the exponentiation of a number
โ Unit Conversion
โ Number Base (Binary, Octal, Hexadecimal, Decimal)
โ Weight (gram, kg, pound)
โ Height (cm, m, inch, feet)
โ Temperature (centigrade, fahrenhite)
โ Distance (km, mile)
โ Area (mยฒ, kmยฒ, acre)
โ Volume (ltr, gallon)
โ Time (sec, min, hour)
โ Currency
โ Calculator
โ Loan EMI Calculator
โ Fixed Deposit Returns Calculator
โ Interest Calculator
โ BMI Calculator
โ Item Price (considering tax, discount, shipping)
โ Tip Calculator
โ Geometry
โ Find distance between 2 points
โ Given 2 sides of a right angle triangle, find the 3rd
โ Find 3rd angle of a triangle when 2 are given
โ Area of a triangle when 3 sides are given
โ Area of a right angle triangle
โ Perimeter of a Square
โ Area of a Square
โ Perimeter of a Rectangle
โ Area of a Rectangle
โ Circumference of a Circle
โโ Area of a Circle
โโ Circumference of a Semi-Circle
โโ Area of a Semi-Circle
โโ Area of a Ring
โโ Circumference of an Ellipse
โโ Area of an Ellipse
โโ Suface Area of a Sphere
โโ Volume of a Sphere
โโ Surface Area of a Hemisphere
20. Volume of a Hemisphere
โโ Surface area of a Cube
โโ Volume of a Cube
โโ Surface area of a Cylinder
โโ Volume of a Cylinder
โ Vector
โ Find Scalar Multiplication of a vector
โ Find addition/subtraction of vectors
โ Find magnitude of a vector
โ Find an unit vector along a given vector
โ Find dot product of 2 vectors
โ Find cross product of 2 vectors
โ Check if 2 vectors are orthogonal
โ Matrix
โ Find the determinant of a matrix
โ Find Scalar Multiplication of a matrix
โ Find addition/subtraction of matrices
โ Find the transpose of a matrix
โ Find if 2 matrices are orthogonal
โ Find inverse of a 2x2 and 3x3 matrix
โ Set
โ Find Union of 2 sets
โ Find Intersection of 2 sets
โ Find the Difference of 2 sets
โ Find the Symmetric Difference of 2 sets
โ Find if a set is subset/superset of another set
โ Find if 2 sets are disjoints
โ Special Numbers
โ Strong Number
โ Perfect Number
โ Armstrong Number
โ Harshad Number
โ Kaprekar Number
โ Lychrel Number
โ Narcissistic Decimal Number
โ Lucus Number
โ Catalan Number
โ Duck Number
โโ Ugly Number
โโ Abundant Number
โโ Deficient Number
โโ Automorphic Number
โโ Magic Number
โโ Friendly Pair Numbers
โโ Neon Number
โโ Spy Number
โโ Happy Number
20. Sunny Number
โโ Disarium Number
โโ Pronic Number
โโ Trimorphic Number
โโ Evil Number
โโ Amicable Pairs
๐ฅ Last Words
โฌ If you want to excel in programming, practice a lot.
โฌ Problems based on numbers are easy to start with and they help in improving your analytical skills.
Join @coderslearning for more โ
Share with your friends! ๐
Happy Learning! ๐๐
๐1
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Begin your journey to success. Take the first step today. ๐
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Data Analyst Roadmap
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Advanced Javascript concepts
https://t.me/Programming_experts/72
Oops in Java
https://nptel.ac.in/courses/106105224
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https://docs.microsoft.com/en-us/learn/modules/intro-to-git/0-introduction
Python Data Structure and Algorithms
https://t.me/programming_guide/76
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๐ค Free AI Courses by Microsoft
1. Fundamentals of AI by Microsoft
https://learn.microsoft.com/en-us/training/paths/get-started-with-artificial-intelligence-on-azure/
2. Introduction to AI with python by Harvard.
https://pll.harvard.edu/course/cs50s-introduction-artificial-intelligence-python
๐ Useful Resources for the Programmers
Data Analyst Roadmap
https://t.me/sqlspecialist/94
Free C course from Microsoft
https://docs.microsoft.com/en-us/cpp/c-language/?view=msvc-170&viewFallbackFrom=vs-2019
Interactive React Native Resources
https://fullstackopen.com/en/part10
Python for Data Science and ML
https://t.me/datasciencefree/68
Ethical Hacking Bootcamp
https://t.me/ethicalhackingtoday/3
Unity Documentation
https://docs.unity3d.com/Manual/index.html
Advanced Javascript concepts
https://t.me/Programming_experts/72
Oops in Java
https://nptel.ac.in/courses/106105224
Intro to Version control with Git
https://docs.microsoft.com/en-us/learn/modules/intro-to-git/0-introduction
Python Data Structure and Algorithms
https://t.me/programming_guide/76
Free PowerBI course by Microsoft
https://docs.microsoft.com/en-us/users/microsoftpowerplatform-5978/collections/k8xidwwnzk1em
Data Structures Interview Preparation
https://t.me/crackingthecodinginterview/309?single
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http://learn.microsoft.com/users/dotnet/collections/yz26f8y64n7k07
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