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aggregation
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
What is the use of group by clause? Group by clause is used to apply aggregate functions to a set of tuples. The attributes given in the group by clause are used to
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4. Describe three ways to handle missing field values
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
What is an Index? An index is a small table having only two columns. The first column has a copy of the primary or candidate key of a table and the second column having a set o
What is data definition language? Explain it in detail? The SQL DDL allows specification of not only a set of relations, but also information after each relation, containing
The primary key is selected from the
DISADVANTAGES OF RDBMS
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