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Difference between SQL and SQL*Plus
SQL
SQL*Plus
SQL is a language
SQL *Plus is an environment
National Standards Institute) standard
It is oracle proprietary interface for
executing SQL statements
It is entered into the SQL buffer on one
or more lines
It is entered one line at a time, not
stored in the SQL buffer
SQL cannot be abbreviated
SQL*Plus can be abbreviated
It uses a termination character to
execute command immediately
It does not require termination
character. Commands are executed immediately.
SQL statements manipulate data and
table definition in the database
It does not allow manipulation of
values in the database
does tables are called relations
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
define normalisation and functional dependency
What it creates while a primary key is combined with a foreign key? It creates Parent-Child relation ship between the tables that connect them while a primary key is combined w
Rules Of Data Normalisation Let us now summarise Normalisation with the help of various clean rules. The following are the necessary rules for the Normalisation process: 1.
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A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples
Explain the Difference between DROP and DELETE DELETE deletes one or more than one tuples of a particular relation from the database. DROP is employed to remove a table from th
Explain the concept of a data model ? Data Model - Model is an abstraction procedure which hides irrelevant details although highlighting details relevant to the application
Architectural standard: Designation : Architect , Consultant Job Profile : As a part of Oracle Fusion Middleware at Satyam, I am involved with Presales, Delivery, A
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