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Questions tagged sql
What is the difference between SparkSession and SparkContext in Spark?
Write an SQL query to find the second-highest salary from an employee table.
What are Airflow Operators? Give examples.
Explain the differences between Data Warehouse, Data Lake, and Delta Lake
Explain the differences between a Data Lake and a Data Warehouse.
Can you explain the difference between OLTP and OLAP?
Describe a time when you had to optimize a slow SQL query. What steps did you take?
How do you handle NULL values in SQL? Mention functions like COALESCE and NULLIF.
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