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Is it important to know databases before learning the basics of Hadoop?

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Yes, it is important to know SQL before learning the basics of hadoop. Basically you need it when you use HIVE. But if you work with PIG then it is not necessary to know SQL. But as a suggestion learning SQL will help you a lot in this field.
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Yes, At least there should be some basic Idea.
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if you are intrested on DBMS data base mangement system you can contact me . This will cover concept of database , normalization and SQL query
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