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The most popular programming languages: 1. Python 2. TypeScript 3. JavaScript 4. C# 5. HTML 6. Rust 7. C++ 8. C 9. Go 10. Lua 11. Kotlin 12. Java 13. Swift 14. Jupyter Notebook 15. Shell 16. CSS 17. GDScript 18. Solidity 19. Vue 20. PHP 21. Dart 22. Ruby 23. Objective-C 24. PowerShell 25. Scala According to the Latest GitHub Repositories

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✅ Python Conditional Statements if, elif, else! 🐍✨ Conditional statements allow your program to make decisions based on different conditions.

age = 20
if age >= 18:
    print("Eligible to vote")

1. What is an if Statement? Executes a block of code only if the condition is True.

age = 20
if age >= 18:
    print("You are an adult")

✔ Output: You are an adult 💡 If the condition is False, the code inside if is skipped. 2. if-else Statement: Used when you want one action if the condition is True and another if it's False.

age = 16
if age >= 18:
    print("Eligible to vote")
else:
    print("Not eligible to vote")

✔ Output: Not eligible to vote 3. if-elif-else Statement: Used to check multiple conditions.

marks = 75
if marks >= 90:
    print("Grade A")
elif marks >= 75:
    print("Grade B")
elif marks >= 60:
    print("Grade C")
else:
    print("Fail")

✔ Output: Grade B 4. Multiple Conditions with and:

age = 25
if age >= 18 and age <= 60:
    print("Working age")

✔ Output: Working age 5. Multiple Conditions with or:

day = "Saturday"
if day == "Saturday" or day == "Sunday":
    print("Weekend")

✔ Output: Weekend 6. Using not Operator:

is_logged_in = False
if not is_logged_in:
    print("Please log in")

✔ Output: Please log in 7. Nested if Statement: An if statement inside another if.

age = 25
has_license = True
if age >= 18:
    if has_license:
        print("You can drive")

✔ Output: You can drive 8. Short-Hand if Statement:

age = 20
if age >= 18: print("Adult")

✔ Output: Adult 9. Ternary One-Line if-else:

age = 16
message = "Adult" if age >= 18 else "Minor"
print(message)

✔ Output: Minor 💡 Useful for simple conditions in one line. 10. Practice Examples: ✔ Check even or odd

num = 8
if num % 2 == 0:
    print("Even")
else:
    print("Odd")

✔ Find the largest number

a = 10
b = 20
if a > b:
    print(a)
else:
    print(b)

✔ Check positive or negative

num = -5
if num >= 0:
    print("Positive")
else:
    print("Negative")

✔ Check password

password = "python123"
if password == "python123":
    print("Access Granted")
else:
    print("Access Denied")

💡 Conditional statements make your programs intelligent by allowing them to make decisions based on different situations. 💬 Tap ❤️ if this helped you learn Python!

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30. Write retention query in SQL? Example logic: Count users who appeared in month X and also in month X+1. WITH this_month AS ( SELECT user_id FROM users WHERE MONTH(join_date) = '2024-01' ), next_month AS ( SELECT user_id FROM users WHERE MONTH(join_date) = '2024-02' ) SELECT COUNT(*) FROM this_month WHERE user_id IN (SELECT user_id FROM next_month); 31. Write year-on-year growth in SQL? SELECT year, revenue, revenue - LAG(revenue) OVER (ORDER BY year) AS YoY_Growth FROM sales; 32. Write a query for cumulative sum in SQL? SELECT date, revenue, SUM(revenue) OVER (ORDER BY date) AS cumulative_revenue FROM sales; 33. Difference between Function and Stored Procedure? Functions return values and are used in expressions. Stored Procedures do not return values directly, can contain complex logic. 34. Do we use variable in views? No, variables cannot be used in views. 35. What are the limitations of views? Cannot use variables Can't call stored procedures Not always updatable Performance depends on underlying query Hope it helps :)

35 Important SQL Interview Questions with Detailed Answers: 1. Explain order of execution of SQL. Order: FROM → JOIN → ON → WHERE → GROUP BY → HAVING → SELECT → DISTINCT → ORDER BY → LIMIT. SQL queries are processed in this logical sequence, not the way they are written. 2. What is difference between WHERE and HAVING? WHERE filters rows before aggregation, while HAVING filters groups after aggregation. 3. What is the use of GROUP BY? GROUP BY aggregates data across rows with the same values in specified columns, commonly used with aggregate functions. 4. Explain all types of joins in SQL? INNER JOIN: Returns matching rows from both tables. LEFT JOIN: All rows from the left, matched rows from right. RIGHT JOIN: All rows from the right, matched rows from left. FULL JOIN: All rows from both, with NULLs where no match. SELF JOIN: Joins table to itself. CROSS JOIN: Cartesian product of both tables. 5. What are triggers in SQL? Triggers are procedural code executed automatically in response to certain events on a table or view (INSERT, UPDATE, DELETE). 6. What is stored procedure in SQL? A stored procedure is a set of SQL statements saved and executed on demand, useful for modularizing code. 7. Explain all types of window functions? RANK(): Gives rank with gaps. DENSE_RANK(): Ranks without gaps. ROW_NUMBER(): Unique row index. LEAD(): Access next row. LAG(): Access previous row. 8. What is difference between DELETE and TRUNCATE? DELETE: Row-wise deletion, can have WHERE clause, logs each row. TRUNCATE: Deletes all rows, faster, minimal logging, cannot rollback easily. 9. What is difference between DML, DDL and DCL? DML: Data Manipulation Language (SELECT, INSERT, UPDATE, DELETE). DDL: Data Definition Language (CREATE, ALTER, DROP). DCL: Data Control Language (GRANT, REVOKE). 10. What are aggregate functions? Functions that return a single value: SUM(), AVG(), COUNT(), MIN(), MAX(). 11. Which is faster: CTE or Subquery? Performance depends on context, but subqueries are sometimes faster as CTEs may be materialized. 12. What are constraints and types? Rules to maintain data integrity. Types: NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK, DEFAULT. 13. Types of Keys? Primary Key Foreign Key Unique Key Composite Key Candidate Key 14. Different types of Operators? Arithmetic: +, -, *, / Comparison: =, <>, >, <, >=, <= Logical: AND, OR, NOT Bitwise, LIKE, IN, BETWEEN 15. Difference between GROUP BY and WHERE? WHERE filters before aggregation. GROUP BY groups after filtering. 16. What are Views? Virtual tables based on SQL queries. They store only query definition. 17. What are different types of constraints? Same as Q12: NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK, DEFAULT. 18. What is difference between VARCHAR and NVARCHAR? VARCHAR: ASCII, 1 byte per char. NVARCHAR: Unicode, 2 bytes per char, supports multiple languages. 19. Similarity for CHAR and NCHAR? CHAR: Fixed-length ASCII. NCHAR: Fixed-length Unicode. 20. What are indexes and their types? Used for faster retrieval. Types: - Clustered - Non-clustered - Unique - Composite - Full-text 21. What is an index? Explain its types. Same as above. Indexes speed up queries by creating pointers to data. 22. List different types of relationships in SQL. One-to-One One-to-Many Many-to-Many 23. Differentiate between UNION and UNION ALL. UNION: Removes duplicates. UNION ALL: Includes duplicates. 24. How many types of clauses in SQL? Common clauses: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY, LIMIT, OFFSET, JOIN, ON. 25. What is the difference between UNION and UNION ALL in SQL? Same as Q23. 26. What are various types of relationships in SQL? Same as Q22. 27. Difference between Primary Key and Secondary Key? Primary Key: Uniquely identifies rows. Secondary Key: May not be unique, used for lookup. 28. What is the difference between WHERE and HAVING? Already answered in Q2. 29. Find second highest salary of an employee? SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees);

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Typical C++ interview questions sorted by experience Junior: - What are the key features of object-oriented programming in C++? - Explain the differences between public, private, and protected access specifiers in C++. - Distinguish between function overloading and overriding in C++. - Compare and contrast abstract classes and interfaces in C++. - Can an interface inherit from another interface in C++? - Define the static keyword in C++ and its significance. - Is it possible to override a static method in C++? - Explain the concepts of polymorphism and inheritance in C++. - Can constructors be inherited in C++? - Discuss pass-by-reference and pass-by-value for objects in C++. - Compare == and .equals for string comparison in C++. - Explain the purposes of the hashCode() and equals() functions. - What does the Serializable interface do? How is it related to Parcelable in Android? - Differentiate between Array and ArrayList in C++. When would you use each? - Explain the distinction between Integer and int in C++. - Define ThreadPool and discuss its advantages over using simple threads. - Differentiate between local, instance, and class variables in C++. Mid: - What is reflection in C++? - Define dependency injection and name a few libraries. Have you used any? - Explain strong, soft, and weak references in C++. - Interpret the meaning of the synchronized keyword. - Can memory leaks occur in C++? - Is it necessary to set references to null in C++? - Why is a String considered immutable? - Discuss transient and volatile modifiers in C++. - What is the purpose of the finalize() method? - How does the try{} finally{} block work in C++? - Explain the difference between object instantiation and initialization. - Under what conditions is a static block executed in C++? - Why are generics used in C++? - Mention some design patterns you are familiar with. Which do you typically use? - Name some types of testing methodologies in C++. Senior: - Explain how std::stoi (string to integer) works in C++. - What is the "double-check locking" problem, and how can it be solved in C++? - Differentiate between StringBuffer and StringBuilder in C++. - How is StringBuilder implemented to avoid the immutable string allocation problem? - Explain the purpose of the Class.forName method in C++. - Define Autoboxing and Unboxing in C++. - What's the difference between Enumeration and Iterator in C++? - Explain the difference between fail-fast and fail-safe in C++. - What is PermGen in C++? - Describe a Java priority queue. - How is performance influenced by using the same number in different types: Int, Double, and Float? - Explain the concept of the Java Heap. - What is a daemon thread? - Can a dead thread be restarted in C++? ✅ Best Telegram channels to get free coding & data science resources -> https://t.me/addlist/4q2PYC0pH_VjZDk5 ENJOY LEARNING 👍👍

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