Note: You need a World Wide Web browser that
recognizes HTML forms to use QBE and QB.
The "query" link next each ACEDB database displays the AGIS Search
Form. This form offers several different query methods, including
QBE and QB.
Query by Example uses simple pattern matching on a
form to select objects. For example, to find all publications with
"Jones" as an author in AAtDB, first select the Paper class. The next
screen is a Query Paper class form with field names and text-entry
boxes. Enter Jones* in the Author box and click the "Search" button
at the top of the form. This returns a list of publications.
Query Builder allows more complex queries. Using the
same query as above, you will see something like this:
Find and select Paper items
where item name
does not exist
is equal to
is not equal to
Change the "item name" to "author" and "exists" to "begins with".
Then enter "Jones" (don't include the quotes) into the text-entry
box. Click the "Search" button at the top of the form and a list of
publications will appear. Queries can be extended by adding additional
fields and conditions.