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DATABASE MANAGEMENT SYSTEMExplain three levels of data abstraction.20247mDatabase Management SystemObject-based logical models are used to describe data at (i) logical level (ii) view level (iii) physical level (iv) None of the above20182mDatabase Management SystemA level that describes how a record is stored is: (i) physical (ii) logical (iii) user (iv) view20192mDATABASE MANAGEMENT SYSTEMWhich of the following refers to the “data about data”? - (i) Directory - (ii) Warehouse - (iii) Sub Data - (iv) Meta Data20242m
PreviousView is a : (i) temporary table (ii) virtual table (iii) dynamic table (iv) permanent tableNextWhich of the following is true? (i) a super-key is always a candidate key. (ii) every 3NF schema is also a BCNF. (iii) generalization is bottom-up approach. (iv) none of these.
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