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The Database administrator (DBA) uses the data dictionary in each phase of a database life cycle, beginning from the data gathering phase to the design, execution and maintenance phases. Documentation given by a data dictionary is as valuable to end users and managers, as it is necessary to the programmers. Users can decide their applications with the database only if they know exactly what is stored in it. For example, the explanation of a data item in a data dictionary may have its origin and other text description in plain English, in addition to its data format. Therefore, users and managers will be able to see exactly what is available in the database. A data dictionary is a road map which helps users to access information within a large database.
Which database object does not physically exist? A view database object does not physically exist.
How to use Oracle
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
Write a short note on built in function in QBE? Built in function in QBE: QBE involves various built in functions like AVG, MAX,MIN,SUM and CNT. We must prefix these operator
why older data models are being replaced by new data models.
A model in database system mostly defines the organisation of data or structure and a set of operations on that data. Relational model is a easy model in which database is represen
what do you understand by enhanced entity-relationship
Define query language? A query is a statement requesting the retrieval of information. The portion of DML that includes information retrieval is known as a query language.
what is 3nf
Explain the two types of participation constraint. 1. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
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