Question - What is a join and explain different types of joins?
Answer -
Joins are used in queries to explain how different tables are related. Joins also let you select data from a table depending upon data from another table.
Types of joins:
INNER JOINs,
OUTER JOINs,
CROSS JOINs
OUTER JOINs are further classified as
LEFT OUTER JOINS,
RIGHT OUTER JOINS and
FULL OUTER JOINS.