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Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
Joins and different types of joins in SQL
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What is sql join?
A SQL join clause combines records from two or more tables in a database.
Sql joins
o INNER JOINo FULL OUTER JOINo RIGHT OUTER JOINo LEFT OUTER JOIN
INNER JOIN
The INNER JOIN keyword returns rows when there is at least one match in both tables.
SYNTAX:-SELECT column_name(s)FROM table_name1INNER JOIN table_name2ON table_name1.column_name=table_name2.column_name
FULL OUTER JOIN The FULL JOIN keyword return rows when there is a match in one of the tables.
SYNTAX:-SELECT column_name(s)FROM table_name1FULL JOIN table_name2ON table_name1.column_name=table_name2.column_name;
RIGHT OUTER JOIN
The RIGHT JOIN keyword returns all the rows from the right table (table_name2), even if there are no matches in the left table (table_name1).SYNTAX:-SELECT column_name(s)FROM table_name1RIGHT JOIN table_name2ON table_name1.column_name=table_name2.column_name
LEFT OUTER JOIN
The LEFT JOIN keyword returns all rows from the left table (table_name1), even if there are no matches in the right table (table_name2).
SYNTAX:-SELECT column_name(s)FROM table_name1LEFT JOIN table_name2ON table_name1.column_name=table_name2.column_name
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