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Explain retrieval in QBE?
Retrieval in QBE : A "GUI" for expressing queries.
But has influenced many projects Especially PC Databases: Paradox, Access, etc.
#question.what is mapping constraints and types?.
Define Database layer? The database layer defines the data formats used in the database.
How external/conceptual mapping and conceptual /internal mapping is performed
NEED FOR A DATABASE MANAGEMENT SYSTEM A Database is a structured, persistent collection of data of an organisation. The database management system (DBMS) manages the database o
What are the disadvantages of file-processing system? Ans: The Disadvantages of File-Processing System a. Data redundancy and inconsistency - Data redundancy means not nece
Information about films holds information about movies, stars and studios. Movies have a title, year of production, length and the film type. Stars have a name and address. Studi
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
How many types of users works on database? Users are differentiated through the way they expect to interact along with the system (i) Application programmers-interact with
i need to submit in this topic.
A distributed transaction consists of subtransactions that execute at different sites and access local DBMSs at those sites. For example, a distributed transaction that transfers m
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