Count the number of nulls in each column of a table.
SQLeasy
4
Database vs Data Warehouse vs Data Mart vs Data Lake
SQLeasy
5
Define cursors and stored procedures and their use cases.
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6
Given a dataset, perform transformations: Filter rows where sales > 1000, Add a new column calculating a 10% discount on sales, Group data by region and calculate total revenue.
SQLeasy
7
How would you clean the data by filtering out records with null values in user_id?
SQLeasy
8
Managed vs Unmanaged Tables
SQLeasy
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