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Advanced Union Query Download
This advanced union query example shows some interesting and advanced concepts. Usually in a union query you are selecting the same or similar data from different tables.
Microsoft Access is a fully capable database and it's primary limitations is the number of concurrent users it will support. Generally, we recommend a limit of 10 to 15 users.
We create databases large and small. Some of our databases help run entire small businesses. We also handle unique businesses such as flyrod manufacturing, cheese making, marina management, and cable tv inventory.
In this example we selecting the individual data records from the table and at the same time using the union query function to select aggregate functions from the same table. In this case we are selecting the average, minimum and maximum revenue values grouped by Department.
This aggregate function technique, including countless variations, can be very use when exporting data to other programs such as Excel. Or perhaps you want to send the revenue data to a website for display. Using this advanced union query technique allows you to avoid performing these aggregate function calculations either on the website, in a spreadsheet or in an Access report. Note that if you using Access reports you'll need to create a Group on the Department field. In some cases grouping can conflict in a report and can make the report difficult to program when there are many summary levels. Here are the results of the union query example:
To examine the union query download our Microsoft Access Union Query Database.
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