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Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational model is an ex
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
Explain pipelining. Ans: In order to describe pipelining in simple terms, think of it as breaking down processor functions into smaller and smaller parts. For instance,
explain multi key file organisation
Define Database layer? The database layer defines the data formats used in the database.
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
explain various steps uses in evaluation and maintenance of MIS.
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
Which database level is closest to the users? External database level is closest to the users.
Software failures : In such cases, a software error abruptly stops the implementation of the current transaction (or all transactions), therefore leading to losing the state of pr
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