Joins and different types of joins dani
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This document discusses different types of SQL joins, including: - JOIN: Returns rows when there is a match between tables - LEFT JOIN: Returns all rows from the left table, even without matches from the right table - RIGHT JOIN: Returns all rows from the right table, even without matches from the left table - FULL JOIN: Returns rows when there is a match in either table Examples of LEFT, RIGHT, and FULL JOINs are provided.
Joins and different types of joins dani
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- 3. JOINS AND DIFFERENT TYPES OF JOINS Mohammed Danish dani3250@gmail.com www.facebook.com/dani325 0 twitter.com/DANI3250 in.linkedin.com/in/mohamm eddanish 9895825222
- 4. Joins • SQL joins are used to query data from two or more tables, based on a relationship between certain columns in these tables.
- 5. Different SQL Joins • JOIN: Return rows when there is at least one match in both tables • LEFT JOIN: Return all rows from the left table, even if there are no matches in the right table • RIGHT JOIN: Return all rows from the right table, even if there are no matches in the left table • FULL JOIN: Return rows when there is a match in one of the tables
- 7. Example
- 8. SQL LEFT JOIN • The LEFT JOIN returns all rows from the left table(table_name1),even if there are no matches in the right table(table_name2)
- 9. Example
- 10. SQL RIGHT JOIN • The RIGHT JOIN return all rows from the right table(table_name2),even if there are no matches in the left table(table_name1).
- 12. SQL FULL JOIN • The FULL JOIN returns rows when there is a match in one of the tables
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