Data Analytics Consultant Interview Questions and Answers

VLOOKUP and HLOOKUP are both Excel functions used to search for a value in a table, but VLOOKUP searches vertically while HLOOKUP searches horizontally.

• VLOOKUP stands for vertical lookup and searches for a value in the first column of a table and returns a value in the same row from a specified column.

• HLOOKUP stands for horizontal lookup and searches for a value in the first row of a table and returns a value in the same column from a specified row.

• VLOOKUP is commonly used to...read more

Data automation refers to the process of using technology to automatically collect, process, and analyze data.

• Data automation involves using software tools and algorithms to streamline data-related tasks.

• It eliminates the need for manual data entry and manipulation, saving time and reducing errors.

• Examples of data automation include automated data extraction from documents, automated data cleansing and transformation, and automated data visualization.

• Data automation can be ap...read more

Truncate removes all records from a table, while delete removes specific records.

• Truncate is faster as it does not log individual row deletions

• Delete is slower as it logs each row deletion

• Truncate resets identity column values, delete does not

• Truncate cannot be rolled back, delete can be rolled back using transactions

Partitioning is the process of dividing a large dataset into smaller, more manageable parts based on certain criteria.

• Partitioning helps in improving query performance by reducing the amount of data that needs to be processed.

• It can be done based on ranges, hash values, or specific columns.

• Examples include partitioning a sales database by date ranges or partitioning a customer database by geographic regions.