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What is NULL?
Simply NULL means not in value.
Guidelines for creation of table: Table name should begin with an alphabet. In table name, single quotes and blank spaces are not allowed. Reserve words of that DBM
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
What are the types of storage devices? Primary storage Secondary storage Tertiary storage Volatile storage Nonvolatile storage
What is a SELECT operation? The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
What are the various states through which a transaction passes through in its lifetime? Briefly discuss all the events that causes transition from one state to another. Ans:
What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
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