Paytm Payments Bank Fraud Analyst Interview Questions and Answers for Freshers

Q1. Difference between rank & dense rank
Ans. 
Rank assigns unique numbers to each row based on the order specified, while dense rank assigns consecutive numbers without gaps.
• Rank leaves gaps in the ranking sequence if there are ties, while dense rank does not

• Rank function is used to assign a unique rank to each row, while dense rank function is used to assign a unique rank to each distinct row

• For example, if there are two rows with the same value and rank 1, the n...read more
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Q2. Given two tables Tell how many values would be there for left right inner outer join
Ans. 
The number of values in different types of joins depends on the relationship between the tables.
• In a left join, all values from the left table are included along with matching values from the right table. The number of values will be equal to the number of rows in the left table.

• In a right join, all values from the right table are included along with matching values from the left table. The number of values will be equ...read more
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Q3. Find the newest customer id for every product
Ans. 
Use SQL query to find the newest customer id for every product
• Use GROUP BY clause to group by product

• Use MAX() function to find the newest customer id for each product

• Join the tables if necessary
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Aptitude reasoning quant and permutations and combinations

A topic was given for a group ..eg cryptocurrency is boon or bane

Python was asked and data warehousing

Q1. Data warehouses concept
Ans. 
Data warehouses are centralized repositories that store integrated data from various sources for analysis and reporting.
• Data warehouses are designed for query and analysis rather than transaction processing.

• They consolidate data from multiple sources to provide a single, comprehensive view of the organization's data.

• Data warehouses often use a dimensional model with facts (measurable, quantitative data) and dimensions ...read more
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Q2. Sql question was asked
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