Relational database are designed for storing operational transactions not designed for managerial reporting.  Business Intelligence on the other hand is a process of Extracting data from relational databases, Transforming and cleaning the data and finally uploading the data into Unified Dimensional Model (UDM) this process known as ETL.  When the data is organized in such a way, it allows fetching managerial reports almost immediately.  With the imagens of the big data, integration of the two systems become to be a must.

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