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Question

What is the key difference between data in source operational systems and data in a data warehouse?

a.

Source data is fresher than data in the warehouse.

b.

Data in the warehouse is more detailed than source data.

c.

ETL functions have been applied to the data in the warehouse.

d.

Data in the warehouse is stored in different formats.

Answer: (c).ETL functions have been applied to the data in the warehouse. Explanation:ETL functions are applied to the source data to transform it into useful information stored in the data warehouse.

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Q. What is the key difference between data in source operational systems and data in a data warehouse?

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