Answer Posted / rohit shori

data abstraction
3 types:-

Physical level describes how a record (e.g., customer) is
stored.
Logical level: describes data stored in database, and the
relationships among the data.
type customer = record
name : string; street :
string; city : integer; end;
View level: application programs hide details of data
types. Views can also hide information (e.g., salary) for
security purposes.

What do you mean by storage classes?

1500

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1024

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1443

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1108

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1012

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1010

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1050

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1047

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1037

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1089

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1032

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986

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1107

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1051

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1359

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