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Answer Posted / mahesh (ezeesoft)
If you change internal low level abstraction database then they dont affect on higl level abstraction.
There are two types of data independance:
1) Physical data independance:
If you change physical level of data then they dont affect on logical level.
2) Logical data independance:
If you change logical level of data then they dont affect on view level
Summary: The ability to modify the schema defination in one level should not affect the schema defination in next higher level.
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