Answer / Subhash Chandra Gupta

Physical data independence refers to the ability to manipulate the structure of a database without affecting the application that uses it. Logical data independence refers to the ability to modify the meaning of data without changing its representation in the database. A simple example would be a table 'Students' with columns 'Name', 'Age', and 'Grade'. Physically, the data may be stored in multiple files, but logically, it is viewed as a single table by the application. If a new column 'Email' is added or removed physically, it does not affect the application's view of the table, ensuring physical data independence. Similarly, if a decision is made to change the way grades are represented (e.g., numeric grades instead of letter grades), the structure of the database may need to be updated, but this should not affect how the 'Students' table appears to the application, ensuring logical data independence.

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