Real questions from top companies in SQL · medium
How do partitions improve query performance in fact tables?
How do tumbling window triggers ensure data consistency in batch processing?
How do you find duplicates in a table based on one or two columns?
How do you handle NULL values in a SQL query to avoid incorrect results?
How do you monitor and debug skewed partitions?
How do you monitor consumer lag in Kafka, and how can you reduce it?
How do you optimize partitioning when dealing with large datasets?
How do you remove duplicates with partitioning?
How does Z ORDERING improve query performance in large datasets?
How does improper partitioning affect Spark job performance?
How does indexing improve query performance in SQL?
How does partitioning in S3 affect Athena query performance?
How many records result from Inner Join, Left Join, Right Join given Table A and Table B?
How many rows result from left, right, full outer, and inner joins?
How soon could you join Meesho if you are selected?
How to Handle Null in Spark
How to merge two tables with identical structures into one?
How to optimize join of large and small tables in Spark?
How would you deal with data skewness in a join operation?
How would you deal with data skewness in a large dataset?
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