UNION Operation (Microsoft Jet SQL)

Microsoft Jet SQL Reference

UNION Operation

Creates a union query, which combines the results of two or more independent queries or tables.


[TABLE] query1 UNION [ALL] [TABLE] query2 [UNION [ALL] [TABLE] queryn [ ... ]]

The UNION operation has these parts:

Part Description
query1-n A SELECT statement, the name of a stored query, or the name of a stored table preceded by the TABLE keyword.

You can merge the results of two or more queries, tables, and SELECT statements, in any combination, in a single UNION operation. The following example merges an existing table named New Accounts and a SELECT statement:

TABLE [New Accounts] UNION ALL


FROM Customers

WHERE OrderAmount > 1000;

By default, no duplicate records are returned when you use a UNION operation; however, you can include the ALL predicate to ensure that all records are returned. This also makes the query run faster.

All queries in a UNION operation must request the same number of fields; however, the fields do not have to be of the same size or data type.

Use aliases only in the first SELECT statement because they are ignored in any others. In the ORDER BY clause, refer to fields by what they are called in the first SELECT statement.


  • You can use a GROUP BY or HAVING clause in each query argument to group the returned data.
  • You can use an ORDER BY clause at the end of the last query argument to display the returned data in a specified order.

See Also
ALL, DISTINCT, DISTINCTROW, TOP Predicates (Microsoft Jet SQL) ORDER BY Clause (Microsoft Jet SQL)
GROUP BY Clause (Microsoft Jet SQL) SELECT Statement (Microsoft Jet SQL)
HAVING Clause (Microsoft Jet SQL) SQL Subqueries
INNER JOIN Operation (Microsoft Jet SQL) WHERE Clause (Microsoft Jet SQL)
LEFT JOIN, RIGHT JOIN Operations (Microsoft Jet SQL)  


UNION Operation Example