D.B ENGINEERING Interview Questions and Answers

SQL queries using group by and order by

• Use GROUP BY to group rows that have the same values into summary rows

• Use ORDER BY to sort the result set in ascending or descending order

• Example: SELECT department, COUNT(*) FROM employees GROUP BY department ORDER BY COUNT(*) DESC

The lowest common ancestor can be used to find the parent.

• The lowest common ancestor is the node that is the closest common ancestor of two nodes in a tree.

• To find the parent, you can traverse the tree from the lowest common ancestor to the root node.

• This is useful in scenarios where you need to find the parent of a node in a tree data structure.

Simpl offers a collaborative and innovative work environment with competitive compensation.

• Simpl values teamwork and creativity in software development

• Competitive compensation package offered to attract top talent

• Opportunities for growth and learning through challenging projects

I can dedicate 20-30 hours per week to the internship.

• I am able to commit 20-30 hours per week to the internship

• I can adjust my schedule to accommodate any additional time needed

• I prioritize my work and can effectively manage my time to meet deadlines

Find duplicates in an array of strings

• Iterate through the array and store each element in a hash set

• If an element is already in the hash set, it is a duplicate

• Return a list of all duplicates found