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How can we do data cleaning?
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More Data Warehouse General Interview Questions
What is a data profile?
List any five applications of data warehouse.
What is difference between model & package?
How can you implement many relations in star schema model?
What are the difference between snow flake and star schema? What are situations where snow flake schema is better than star schema to use and when the oppositeis true?
Define data warehouse?
How much data hold in one universe.
What is perform recovery?
How to create context?
What are the approaches used by optimizer during execution plan?
Explain what is full load & incremental or refresh load?
What Oracle features can be used to optimize my Warehouse system?
Teradata 
