BlueGiant Interactive Interview Questions and Answers

Q1. What is the difference between Union and Union all ?
Ans. 
Union combines the results of two or more SELECT statements, while Union all includes all rows, including duplicates.
• Union removes duplicate rows from the result set, while Union all includes all rows.

• Union sorts the result set, while Union all does not.

• Union is slower than Union all because it performs a distinct operation.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FRO
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Q2. Which query is more faster , joins or union?
Ans. 
Joins are generally faster than unions.
• Joins are typically faster than unions because they combine data from multiple tables based on a common column, while unions combine data from multiple queries into a single result set.

• Joins can utilize indexes on the columns being joined, which can improve performance.

• Unions involve combining the results of multiple queries, which can be slower as it requires merging and sorting ...read more
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MCQ based on programming, 2 programming problems

Q1. What is copy constructor ?
Ans. 
Copy constructor is a special constructor that creates a new object by copying an existing object.
• It is used to initialize an object with another object of the same class.

• It takes a reference to an object of the same class as an argument.

• It creates a new object with the same values as the object passed as argument.

• It is automatically called when a new object is created from an existing object.

• Example: MyClass obj1; MyC
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Q2. What is shallow copy and deep copy ?
Ans. 
Shallow copy creates a new object with the same reference as the original, while deep copy creates a new object with a new reference.
• Shallow copy only copies the top-level object, while deep copy copies all nested objects.

• Shallow copy is faster and uses less memory, while deep copy is slower and uses more memory.

• Examples of shallow copy include copying arrays and objects using the spread operator, while examples of dee...read more
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Q3. Implement Merge Sort on an array
Ans. 
Implementation of Merge Sort on an array
• Divide the array into two halves

• Recursively sort the two halves

• Merge the sorted halves

• Time complexity: O(n log n)

• Space complexity: O(n)
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Q4. What are Virtual Functions ?
Ans. 
Virtual functions are functions that can be overridden by derived classes.
• Virtual functions are declared in a base class and can be overridden in derived classes.

• They allow for polymorphism, where a derived class object can be treated as a base class object.

• Virtual functions are called based on the actual object type, not the pointer or reference type.

• They are declared using the virtual keyword in the base class and ca...read more
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Q5. What are you good at in C++ ?
Ans. 
I am good at object-oriented programming, data structures, and algorithms in C++.
• Strong understanding of object-oriented programming principles

• Proficient in implementing data structures and algorithms in C++

• Experience with memory management and pointers

• Familiarity with C++ standard library and STL

• Ability to optimize code for performance and efficiency
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Q1. Why do you want to get this job ?
Ans. 
I am passionate about software development and this job aligns perfectly with my skills and interests.
• I have a strong passion for software development and enjoy solving complex problems.

• This job offers the opportunity to work on cutting-edge technologies and contribute to innovative projects.

• I am excited about the company's mission and values, and believe in the positive impact software can have on society.

• I am eager t...read more
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Q2. How long will you stay in this company ?
Ans. 
I am committed to staying with the company for the long term and contributing to its success.
• I am looking for a stable and challenging work environment.

• I believe in the company's mission and values.

• I am eager to grow and develop my skills within the company.

• I am open to new opportunities and challenges that may arise.

• I am committed to building strong relationships with my colleagues and contributing to a positive work
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