Real questions from top companies · medium
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 to Handle Null in Spark
How to optimize join of large and small tables in Spark?
How would you deal with data skewness in a large dataset?
How would you handle data type changes for an existing column?
How would you handle duplicate or corrupted data in a batch ETL job?
How would you handle nulls in a SQL join? Provide examples using COALESCE.
How would you identify duplicate records based on a composite key in SQL?
How would you optimize a query fetching sales data across multiple countries with billions of rows?
How would you optimize a query with multiple joins and subqueries?
How would you prevent small file problems in S3 when loading data into Redshift?
How would you retrieve the first and last order for each customer from a sales table?
Identify and remove duplicate records from a table, keeping the most recent record based on a timestamp column.
If manual partitions are created in a Hive data-warehouse table directory, and you query records from those partitions, will you see the data? If not, how can this be fixed?
Implement a CASE WHEN condition - medium difficulty
Kafka Partitioning: How would you ensure even load distribution across Kafka partitions in a high-volume system?
Teradata to Hadoop migration and handling data with SCD Type 2?
Test SQL skills using advanced window functions such as LAG, LEAD, and DENSE_RANK.
Two tables: Table 1 has 8 records, Table 2 has 2 records, common column id. How many records would result with Inner Join, Left Join, Right Join, Full Outer Join?
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