WHAT ARE THE TYPES OF JOINS IN SQL?

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Saraswat World 417 June 8, 2023 0 Comments

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score 0 · Answer 1 · 2023-06-08T18:22:10+00:00

JOIN clause combine rows from two or more tables, based on a common field between them.

There are five types of JOIN, defined by ANSI standard SQL–

Sr.	JOIN TYPES	USAGE
1	INNER JOIN	Returns records that have matching values in both tables
2	LEFT OUTER JOIN	Returns all records from left table and matching records from right table
3	RIGHT OUTER JOIN	Returns all records from right table, and matching records from the left table
4	FULL OUTER JOIN	Returns all records when there is a match in either left or right table
5	CROSS JOIN	Returns combinations of each row of the first table with the each row from second table.

TYPE OF JOINS IN SQL

Syntax for INNER JOIN,LEFT JOIN,RIGHT JOIN,FULL OUTER JOIN-

SELECT <column_name(s)>

FROM <table1>

[INNER JOIN|LEFT JOIN|RIGHT JOIN|FULL OUTER JOIN]<table2>

ON <table1.column_name=table2.column_name>

WHERE<condition>;

Syntax for CROSS JOIN-

SELECT <column_name(s)>

FROM <table1>

CROSS JOIN<table2>;

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