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I applied via Naukri.com and was interviewed in Dec 2023. There were 2 interview rounds.
Power bi assignment was given to solve
Optimization techniques in SQL involve using indexes, query optimization, and proper database design.
Use indexes on columns frequently used in WHERE clauses to speed up query performance
Avoid using SELECT * and instead specify only the columns needed in the query
Optimize queries by using appropriate join types and conditions
Normalize database tables to reduce redundancy and improve query efficiency
Sub queries in SQL are queries nested within another query to retrieve data based on the result of the outer query.
Sub queries can be used in SELECT, INSERT, UPDATE, and DELETE statements.
They can be used to filter results, retrieve data from multiple tables, or perform calculations.
Example: SELECT * FROM table1 WHERE column1 = (SELECT column2 FROM table2 WHERE condition);
Types of joins in SQL include inner join, left join, right join, and full outer join.
Inner join: Returns rows when there is a 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 outer join: Returns all rows when there is a match in either table
Time intelligence functions in Power BI are used to analyze and compare data based on time periods.
Time intelligence functions help in calculating year-to-date, month-to-date, and other time-based calculations.
Functions like TOTALYTD, SAMEPERIODLASTYEAR, and PARALLELPERIOD are commonly used for time intelligence in Power BI.
These functions allow for easy comparison of data across different time periods and help in tren
Row level security in Power BI allows users to restrict access to specific rows of data based on their role or criteria.
Row level security can be implemented by creating roles in Power BI and defining rules to filter data based on user roles.
Users can be assigned to specific roles which determine the data they have access to.
Row level security helps in ensuring data privacy and compliance with regulations.
For example, ...
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posted on 18 Nov 2024
I applied via AmbitionBox and was interviewed in Aug 2023. There were 2 interview rounds.
Related to data entry operator with support
I applied via Company Website and was interviewed before Jul 2023. There were 2 interview rounds.
I am a detail-oriented individual with strong data entry skills and a passion for accuracy.
Experienced in data entry tasks such as inputting information into databases
Proficient in using Microsoft Excel and other data entry software
Strong attention to detail and ability to maintain accuracy in high-volume data entry tasks
I am a detail-oriented individual with strong data entry skills and a passion for accuracy.
Experienced in data entry tasks such as inputting information into databases
Proficient in using Microsoft Excel and other data entry software
Strong attention to detail and accuracy in data entry work
Ability to work efficiently under pressure and meet deadlines
I am detail-oriented, efficient, and have a strong background in data entry.
I have a proven track record of accurately entering data in a timely manner.
I am proficient in using data entry software and have a fast typing speed.
I have excellent attention to detail and can spot errors quickly to ensure data accuracy.
posted on 16 Oct 2022
I applied via Recruitment Consulltant and was interviewed before Oct 2021. There were 4 interview rounds.
There were 2 SQL queries based on rank function and count aggregation. 1 python program based on array.
Redshift is a cloud-based data warehousing solution by AWS. It uses columnar storage and massively parallel processing.
Redshift is based on PostgreSQL and uses SQL for querying data.
It uses columnar storage which is optimized for analytical queries.
Redshift is a massively parallel processing (MPP) system, which means it can distribute queries across multiple nodes for faster processing.
It uses key-based sharding to dis...
Sliding window technique is used to solve problems where we need to find a substring of a certain length in a larger string.
Define the window size and slide it over the string
Use two pointers to keep track of the start and end of the window
Examples: Maximum sum subarray of size K, Longest substring with K distinct characters
Design a data pipeline to display hourly activity on a smartwatch for the last 24 hours using SQL queries.
Create a table to store activity data with columns for timestamp and activity type.
Use a SQL query to aggregate activity data by hour for the last 24 hours.
Display the results on the smartwatch using a suitable visualization.
posted on 2 Feb 2024
I applied via Campus Placement and was interviewed before Feb 2023. There were 3 interview rounds.
Aptitude test involving coding
posted on 12 Jul 2023
I applied via campus placement at Vellore Institute of Technology (VIT) and was interviewed before Jul 2022. There were 4 interview rounds.
For campus placement it will be a mix of logical reasoning, english proficiency , mathematical abilty etc
I applied via Naukri.com and was interviewed before Oct 2020. There were 3 interview rounds.
Data Scientist interview questions on model building, random forest, ROC curve, gradient boosting, and real estate valuation
For model building, I followed the CRISP-DM process and used various algorithms like logistic regression, decision trees, and random forest
Random forest hyperparameters include number of trees, maximum depth, minimum samples split, and minimum samples leaf
ROC curve is a graphical representation of...
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