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An index is a data structure that improves the speed of data retrieval operations in a database by allowing quick access to specific data.
Indexes are used to quickly locate data without having to search every row in a database table.
They are created on specific columns in a table to speed up queries that filter or sort by those columns.
Examples of indexes include primary keys, unique keys, and non-unique indexes.
I applied via Walk-in and was interviewed in Apr 2021. There was 1 interview round.
To delete duplicates, use SQL query with DISTINCT keyword or remove duplicates programmatically in Python using sets.
Use SQL query with DISTINCT keyword to remove duplicates from a database table
In Python, remove duplicates from a list using sets: list(set(original_list))
For pandas DataFrame, drop duplicates using df.drop_duplicates()
I applied via Naukri.com and was interviewed before Jun 2023. There was 1 interview round.
I applied via Campus Placement
Basic maths questions
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HackerEarth / Hacker rank Test
Using dynamic programming to find the lowest cost for metro passes based on given days.
Create an array to store the minimum cost for each day.
Iterate through each day and calculate the minimum cost based on 1, 7, or 30 day pass.
Update the minimum cost for each day using dynamic programming.
Return the minimum cost for the total number of days needed.
I applied via Referral and was interviewed before Jun 2021. There were 3 interview rounds.
SQL server
SQL DBA
Prime numbers are numbers that are only divisible by 1 and themselves.
Start by checking if the number is less than 2, as prime numbers start from 2.
Iterate from 2 to the square root of the number and check if the number is divisible by any of these numbers.
If the number is not divisible by any number in the range, then it is a prime number.
I applied via Campus Placement
The first round which is online assessment for eliminating candidates was conducted consist of medium level aptitude questions there were 3 sub sec have duration of 20 15 15 minutes and questions 15 10 10 respectively and you cannot move to further section there is time constraints for each then followed by 15 minutes psychometric section having 50 questions that's all for screening round the total duration was 65 min.
Total 24 candidates were selected from this round out of 200 plus
based on 1 interview
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