The UNION keyword enables you to include the results of two SELECT statements in one resulting table. All rows returned from either SELECT statement are combined into the result of the UNION expression. For examples, see SELECT Examples (Transact-SQL) and Combining Results Sets with UNION
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The Diagram pane can only display one SELECT clause. Therefore, when you are working with a UNION query, Query Designer hides the Table Operations pane.
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To create a Merged SELECT query
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Open a query or create a new one.
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In the SQL pane, type a valid UNION expression.
The following example is a valid UNION expression.
SELECT ProductModelID, Name
FROM Production.ProductModel
UNION
SELECT ProductModelID, Name
FROM dbo.Gloves;
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On the Query Designer menu, click Execute SQL to run the query.
Your UNION query is now formatted by Query Designer.
Concepts
Supported Query Types (Visual Database Tools)
Combining Results Sets with UNION
Other Resources
Designing Queries and Views How-to Topics (Visual Database Tools)
Performing Basic Operations with Queries (Visual Database Tools)
UNION (Transact-SQL)
Help and Information
Getting SQL Server 2008 Assistance