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16. Data independence means
Data is defined separately and not included in programs.
Programs are not dependent on the physical attributes of data.
Programs are not dependent on the logical attributes of data.
Both (B) and (C).
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17. E-R model uses this symbol to represent weak entity set ?
Dotted rectangle.
Diamond.
Doubly outlined rectangle.
None of these.
18. SET concept is used in :
Network Model
Hierarchical Model
Relational Model
None of these
19. Relational Algebra is
Data Definition Language
Meta Language
Procedural query Language
None of the above
20. Key to represent relationship between tables is called
Primary key
Secondary Key
Foreign Key
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