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Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
Consider entity type Employee with attributes empNumber (this is unique), empName, and the year when he/she was hired. An employee can either be a technical employee, a marketing e
What is a data dictionary? Data Dictionary is a main source of data in a data management system. Its major function is to carry the creation and management of data definition
Consider the ER schema below for the MoneyMaking supermarket chain problem. Translate the given ER schema into SQL CREATE TABLE statement.
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Can we delete data element, which is being used by table fields. No we cant delete data element.
Question: (a) Why is it important to know the architecture rather than to start requirement capture when designing a large scale system? (b) Who are the different people in
Define the five basic operators of relational algebra? Five basic operators of relational algebra are: 1. Union (∪∪∪∪) - Selects tuples which are in either P or Q or in both
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