20+ Amazon Interview Questions and Answers

To debug the slow behavior of the API, analyze network latency, check for database issues, monitor server performance, and review code for potential bottlenecks.

• Analyze network latency to identify any issues with data transmission.

• Check for database issues such as slow queries or insufficient indexing.

• Monitor server performance to ensure it has enough resources and is not overloaded.

• Review the code for potential bottlenecks, such as inefficient algorithms or excessive databas...read more

Find the length of longest substring composed of same digit within a string of digits.

• Iterate through the string and keep track of the current digit and its count

• Update the maximum count whenever a new digit is encountered

• Return the maximum count

Find maximum and second maximum number in an array without using sort and single loop.

• Initialize max and secondMax variables to the smallest possible integer value

• Iterate through the array and update max and secondMax accordingly

• Return max and secondMax as the result

Query to find occurrence count of a character in a column of string datatype

• Use the function LENGTH to get the length of the string

• Use the function REPLACE to replace all characters except the one you want to count

• Use the function LENGTH again to get the count of the character

To delete duplicate records, use the DELETE statement with a subquery to identify and remove the duplicates.

• Identify the columns that contain duplicate data.

• Use the GROUP BY clause to group the data by those columns.

• Use the HAVING clause to filter the groups that have more than one row.

• Use a subquery to select the duplicate rows.

• Use the DELETE statement with the subquery to remove the duplicates.

The command to update Group Policy is gpupdate.

• Open Command Prompt as an administrator

• Type 'gpupdate' and press Enter

• Wait for the process to complete

• Group Policy will be updated on the local computer

Design a login page with OTP verification sent to user's mobile.

• Create a login page with fields for mobile number and OTP input

• Generate and send OTP to user's mobile number upon submission of mobile number

• Verify OTP entered by user before allowing login

• Implement timeout for OTP validity to enhance security

Zenoti is a cloud-based software for spa, salon, and medspa businesses to manage appointments, marketing, POS, and more.

• Cloud-based software for spa, salon, and medspa businesses

• Helps manage appointments, marketing, POS, and more

• Provides tools for customer engagement and retention

• Offers analytics and reporting capabilities

• Used by businesses in the beauty and wellness industry

Null data values in joins can be handled using COALESCE function or LEFT JOIN with IS NULL condition.

• Use COALESCE function to replace null values with a specified default value

• Use LEFT JOIN with IS NULL condition to include rows with null values in the result set

• Consider using CASE statements to handle null values based on specific conditions

Design an online system to book salon professionals like Urban Company.

• User registration and login system

• Search functionality to find salon professionals based on location, services offered, ratings, etc.

• Booking system with calendar availability and payment integration

• Review and rating system for users to provide feedback on salon professionals

• Notification system for booking confirmations, reminders, and updates

Use SQL query with LENGTH and REPLACE functions to count number of A's in a word.

• Use LENGTH function to get the total length of the word.

• Use REPLACE function to remove all characters except 'A'.

• Subtract the length of the word after replacing all characters except 'A' from the original length to get the count of 'A's.

Yes, I am comfortable with video packaging tasks.

• I have experience in creating video packages for various projects.

• I am proficient in using video editing software to package videos effectively.

• I understand the importance of packaging videos to enhance viewer engagement.

• I am detail-oriented and can ensure that the packaging aligns with the overall message of the video.

The count of occurrences of a specific character in a word.

• Iterate through each character in the word

• Check if the character is equal to 'a'

• If yes, increment a counter variable

• Return the counter variable as the count of occurrences

Success can be measured through various metrics such as user engagement, revenue growth, and customer satisfaction.

• Track user engagement metrics such as daily active users, time spent on the product, and retention rate.

• Monitor revenue growth through metrics such as conversion rate, average revenue per user, and customer lifetime value.

• Conduct customer satisfaction surveys and track Net Promoter Score (NPS) to gauge user satisfaction.

• Analyze market share and competitive positi...read more

I will enable sales by developing targeted marketing strategies, providing sales training, and implementing effective lead generation tactics.

• Develop targeted marketing strategies to reach potential customers

• Provide sales team with training and resources to effectively sell products/services

• Implement lead generation tactics such as email marketing campaigns, social media advertising, and SEO optimization

Our hiking app helps users plan and track their hikes with detailed maps, trail information, and social features.

• Allow users to search for nearby trails and filter by difficulty level and distance

• Provide detailed trail maps with elevation and terrain information

• Include social features such as the ability to share photos and reviews with other hikers

• Allow users to track their progress and save their favorite trails for future hikes

Print the longest increasing subsequence of an array of strings.

• Use dynamic programming to find the longest increasing subsequence.

• Iterate through the array and keep track of the longest increasing subsequence ending at each index.

• Return the longest increasing subsequence found.

SQL query order of execution determines the sequence in which different parts of a query are processed.

• SQL query is parsed and checked for syntax errors

• Query optimizer creates an execution plan

• Data is retrieved from tables based on the execution plan

• Filters and joins are applied to the retrieved data

• Aggregations and calculations are performed on the filtered data