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Define the terms 1) physical schema 2) logical schema.
Physical schema: The physical schema explains the database design at the physical level, which is the lowest level of abstraction describing how the data are actually stored.
Logical schema: The logical schema explains the database design at the logical level, which explains what data are keeps in the database and what relationship exists between the data.
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
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Java program for horrizontal fragmentation in distributed database
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