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.

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