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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
Redo Logs: Any database must have minimum two redo logs. These are the rules for the database; the redo logs record all modifies to the system objects or user objects. If any type
Consider the following frequency counts of some itemsets in a transaction database r : freq({A}, r) = 0.405 freq({B}, r) = 0.510 freq({C}, r) = 0.303 freq({A
Haw does it work one database application
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
Differentiate between B-tree and B + tree Ans: A B-tree (or Balanced Tree) is a search tree along with additional constraints that makes sure that the tree is all the time
Insertion Anomaly: Inability to show certain information-The primary key of the over relation be (enrolment number, Cno). Any new tuple to be inserted in the relation should have
What is the disadvantage of a call by reference? During a call by reference damage or loss of data is not restricted to the subroutine, but will instantly lead to alters to th
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
In order to keep pace with competitors, Space Ltd has decided to implement an ERP system in order to replace its old legacy and manual systems. Management does not have much knowle
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