Dataframes Interview Questions

15 real Dataframes questions asked in live technical interviews — each with a model answer. Updated weekly.

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What is question 2 in PySpark?🟡 Medium · Conceptual · Asked 2×Write PySpark code to read a JSON file containing records with fields first_name and last_name. Drop records where first_name is null. Add a new column FULL_NAME by concatenating first_name and last_name. Then display all three columns only when FULL_NAME length is greater than 30 characters.🟡 Medium · Coding · Asked 2×How can I implement the given SQL query using PySpark instead of SQL?🟡 Medium · Coding · Asked 1×What is the difference between an anti join and a left anti join?🟡 Medium · Conceptual · Asked 1×How would you retrieve the top two orders by amount for each store for a given month using PySpark?🟡 Medium · Coding · Asked 1×How do you use the explode() function on the 'skills' column in a PySpark DataFrame to create a separate row for each skill while preserving the 'name' column?🟢 Easy · Coding · Asked 1×Why are Spark DataFrames and Datasets optimized in the backend compared to using RDDs?🟡 Medium · Conceptual · Asked 1×Why did Spark evolve from RDDs to DataFrames and Datasets?🟡 Medium · Conceptual · Asked 1×Give an example of PySpark code to perform an operation on a DataFrame.🟡 Medium · Coding · Asked 1×How do you perform basic operations on a dataframe?🟢 Easy · Conceptual · Asked 1×In PySpark, please write a code snippet to perform a join between two DataFrames.🟡 Medium · Coding · Asked 1×Give PySpark code to calculate the friend acceptance rate for each date when friend requests were sent. A request is sent if action = 'sent' and accepted if action = 'accepted'. If a request is not accepted, there is no record of it being accepted in the table. The output should only include dates where requests were sent and at least one of them was accepted (acceptance can occur on any date after the request is sent).🟡 Medium · Coding · Asked 1×How do you drop duplicate records in PySpark?🟡 Medium · Coding · Asked 1×How do you drop duplicate records in PySpark?🟡 Medium · Coding · Asked 1×Can you explain what DataFrames are?🟢 Easy · Conceptual · Asked 1×

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