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List the drawbacks of relational database system
A) Repetition of data
B) Inability to s certain information.
explain the mapping constraints
what are the states of transaction?
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
Define the terms i) DDL ii) DML DDL: Data base schema is specified by a set of definitions expressed by a special language known as a data def
usecase diagram,activity diagraM,SEQUENCE DIAGRAM
What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
How can we Classify the operations on classes This step fundamentally means all three models functional, object and dynamic (studied in last section) must be combined so that
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
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