MYSQL Unions

Union operator

The UNION operator is used to combine the result-set (only distinct values) of two or more SELECT statements.

Query:

(To selects all the different cities (only distinct values) from the "Customers" and the "Suppliers" tables)

SELECT City FROM Customers
UNION
SELECT City FROM Suppliers
ORDER BY City;

Result:

Number of Records: 10
City
------
Aachen
Albuquerque
Anchorage
Annecy
Barcelona
Barquisimeto
Bend
Bergamo
Berlin
Bern

Union ALL

UNION ALL to select all (duplicate values also) cities from the "Customers" and "Suppliers" tables.

Query:

SELECT City FROM Customers
UNION ALL
SELECT City FROM Suppliers
ORDER BY City;

Result:

Number of Records: 12
City
-------
Aachen
Albuquerque
Anchorage
Ann Arbor
Annecy
Barcelona
Barquisimeto
Bend
Bergamo
Berlin
Berlin
Bern

Conclusion

In this page (written and validated by A. Gawali) you learned about MYSQL Unions . What's Next? If you are interested in completing MYSQL tutorial, your next topic will be learning about: MYSQL client.

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