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SQL UNION and UNION ALL Keywords

❮ SQL Keywords Reference


UNION

The UNION command combines the result set of two or more SELECT statements (only distinct values)

The following SQL statement returns the cities (only distinct values) from both the "Customers" and the "Suppliers" table:

Example

SELECT City FROM Customers
UNION
SELECT City FROM Suppliers
ORDER BY City;
Try it Yourself »

UNION ALL

The UNION ALL command combines the result set of two or more SELECT statements (allows duplicate values).

The following SQL statement returns the cities (duplicate values also) from both the "Customers" and the "Suppliers" table:

Example

SELECT City FROM Customers
UNION ALL
SELECT City FROM Suppliers
ORDER BY City;
Try it Yourself »

❮ SQL Keywords Reference