TIAA Global Business Services Big Data Engineer Interview Questions and Answers

Q1. SQL and Python and Spark related questions
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Q2. Project-oriented questions
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Q1. Coding and AWS cloud-related questions like GLUE, LAMBDA, Redshift etc
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Q2. Project and managerial-related questions
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Q1. How you calculate the tdi and mdi of a customer in sql
Ans. 
To calculate TDI and MDI of a customer in SQL, you need to aggregate and analyze the customer's transaction data.
• Calculate Total Daily Income (TDI) by summing up the income of the customer for each day.

• Calculate Monthly Daily Income (MDI) by averaging the TDI for each day in a month.

• Use SQL functions like SUM, AVG, and GROUP BY to perform the calculations.

• Example: SELECT SUM(income) AS TDI, AVG(income) AS MDI FROM tran
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They asked about the sas,sql,and power bi

One sql and one basic python dict question

Q1. Questions on big data mostly spark
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Q2. Project based questions
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Q1. SQL Window functions
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Q2. Excel computed fields in pivot tables
Ans. 
Excel pivot tables allow users to create computed fields using formulas.
• In Excel pivot tables, computed fields are created by adding a new field with a formula.

• Formulas can be simple arithmetic operations or more complex calculations.

• Computed fields can be used to perform calculations on existing data in the pivot table.

• Examples: calculating profit margin by dividing revenue by cost, calculating average sales per month
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Q3. Difference in precision and recall
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Precision is the ratio of correctly predicted positive observations to the total predicted positives, while recall is the ratio of correctly predicted positive observations to the all observations in actual class.
• Precision focuses on the accuracy of positive predictions, while recall focuses on the proportion of actual positives that were correctly identified.

• Precision = TP / (TP + FP)

• Recall = TP / (TP + FN)

• Example: In...read more
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Q1. About past experience
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Q2. Past project details
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Q1. Different joins
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Q2. Case study
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Revenue impact for casino

Basic aptitude questions

Data structure and algorithms

Q1. Java, SQL questions
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Q1. Casual talk about roles
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Q1. Technical.purely
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Q1. Purely tech..and then you present a dashboard on power bi
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Q1. PartitionBy vs bucketBy in spark
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