| | In 1980, Bill Inmon known as father of data warehousing. "A Data warehouse is a subject oriented, integrated ,time variant, non volatile collection of data in support of management's decision making process".
- Subject oriented : means that the data addresses a specific subject such as sales, inventory etc.
- Integrated : means that the data is obtained from a variety of sources.
- Time variant : implies that the data is stored in such a way that when some data is changed.
- Non volatile : implies that data is never removed. i.e., historical data is also kept.
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