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What is trigger?
Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
In which format database schema is written ? Data base schema is written in the DDL format.
Define NULL value NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which
INSERT INTO command : Values can be inserted for all columns or for the selected columns Values can be given by sub query. In place of values parameter substitution
What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).
When are two schedules said to be view equivalent? Ans: Two schedules that is denoted as S and S' are said to be view equivalent if the subsequent three conditions are met
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
what is the need of a log in dbms
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
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:
explain thee diffrent types of data models
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