Set - 1

Question 11 :

SPOOL

Answer :

SPOOL command creates a print file of the report.


Question 12 :

JOIN

Answer :

JOIN is the form of SELECT command that combines info from two or more tables.
Types of Joins are Simple (Equijoin & Non-Equijoin), Outer & Self join.
Equijoin returns rows from two or more tables joined together based upon a equality condition in the WHERE clause.
Non-Equijoin returns rows from two or more tables based upon a relationship other than the equality condition in the WHERE clause.
Outer Join combines two or more tables returning those rows from one table that have no direct match in the other table.
Self Join joins a table to itself as though it were two separate tables.


Question 13 :

Union

Answer :

Union is the product of two or more tables.


Question 14 :

Intersect

Answer :

Intersect is the product of two tables listing only the matching rows.


Question 15 :

Minus

Answer :

Minus is the product of two tables listing only the non-matching rows.