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external and internal mapping with examples
why are older data models are being replaced by new data models
explain in details about one to one binary relationship
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
Can we delete data element, which is being used by table fields. No we cant delete data element.
Attributes attached to an entity can be of various types. Simple The attribute that cannot be further separated into smaller parts and shows the basic meaning is known as a
(a) Why did SAP introduce the extended star schema?
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
What are the DBMS languages? Briefly explain? Data Definition language (DDL):A database schema is specified through a set of definitions expressed through a special language
What are the ways of obtaining the connection parameters? Hardwire the parameters into the program. Ask for the parameters interactively. Get the parameters
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