KONE Full Stack Developer Interview Questions and Answers

Related to logical,verbal

Q1. Related to coding,basic programming questions
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Q1. Explain the differences between SQL joins (Inner, Left, Right and Full join)
Ans. 
SQL joins (Inner, Left, Right, Full) are used to combine rows from two or more tables based on a related column between them.
• Inner join: Returns rows when there is at least one match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full join: Returns rows when there is a mat
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Q1. OOPS concepts like encapsulation, abstraction
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Q2. Code to print most repeated in array
Ans. 
Code to print most repeated string in array
• Iterate through array and count occurrences of each string

• Store counts in a dictionary

• Find the string with the highest count
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Quantitative Aptitude, Numerical Ability, Synonym etc

Q1. Introduce yourself Where you did Training? What was your academic project? Guide? What do you like? Tractor or Implement? What is your aim?
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There were 4 sections and first one was quant, second one was logical, third was English and finally 3 coding questions in last section

4 codes and 5 technical questions

Q1. Explain multi threading
Ans. 
Multi threading is the ability of a CPU to execute multiple threads concurrently.
• Allows for parallel execution of tasks, improving performance

• Each thread has its own stack and runs independently

• Threads can communicate and synchronize using shared memory

• Examples: running multiple tasks simultaneously in a web server, processing data in parallel
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Q2. What is polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types.

• Examples include method overloading and method overriding in object-oriented programming.
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Q3. Diff b/w inner and outer joins
Ans. 
Inner join returns only the rows that have matching values in both tables, while outer join returns all rows from both tables.
• Inner join: returns rows with matching values in both tables

• Outer join: returns all rows from both tables, with NULL values where there is no match

• Example: Inner join - SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id

• Example: Outer join - SELECT * FROM table1 LEFT OUTER JOIN table
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The GD was good they give you current topic and questions related to that

Q1. Tell me about yourself
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Q2. What is role and responsibilities of leader
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Topic given you need to stand out

Case study given regarding marketing opportunity

Q1. Interview taken
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The test was good and the difficulty level was above average.

They have asked me three number of coding questions which I had answered very well.