Data Engineering Analyst
Data Engineering Analyst Interview Questions and Answers for Freshers
Q1. Product Of Array Except Self Problem Statement
You are provided with an integer array ARR
of size N
. You need to return an array PRODUCT
such that PRODUCT[i]
equals the product of all the elements of ARR
except...read more
The problem requires returning an array where each element is the product of all elements in the input array except itself.
Iterate through the array twice to calculate the product of all elements to the left and right of each element.
Use two arrays to store the products of elements to the left and right of each element.
Multiply the corresponding elements from the left and right arrays to get the final product array.
Handle integer overflow by taking modulo MOD = 10^9 + 7.
To so...read more
Q2. Maximum Subarray Sum Problem Statement
Given an array ARR
consisting of N
integers, your goal is to determine the maximum possible sum of a non-empty contiguous subarray within this array.
Example of Subarrays:...read more
Find the maximum sum of a contiguous subarray within an array of integers.
Use Kadane's algorithm to find the maximum subarray sum efficiently.
Initialize two variables: max_sum and current_sum.
Iterate through the array and update current_sum and max_sum accordingly.
Return the max_sum as the result.
Q3. Window analytical functions, difference and how to use them
Window analytical functions are used to perform calculations across a set of table rows related to the current row.
Window functions operate on a set of rows related to the current row
They allow calculations to be performed across a group of rows
Common window functions include ROW_NUMBER(), RANK(), DENSE_RANK(), and NTILE()
They are used with the OVER() clause in SQL queries
Q4. SQL query to find nth highest salary
Use SQL query with ORDER BY and LIMIT to find nth highest salary.
Use ORDER BY clause to sort salaries in descending order
Use LIMIT to specify the nth highest salary
Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT n-1, 1
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