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Any User may create a new Data Query object,
provided of course that we have access to the Data Source and Fields.
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For a new Query, we do not choose the Key. Instead,
we type 'new', and then the system will generate a Key.
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We give a description, so that we, and possibly
others, can identify the Query on Lookups.
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We will always select a Data Source, and the system
will offer a list of Files that may be queried. Whether this User may actually
query the File will be checked at execution time.
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Once we have selected a Data Source, we may select
a Data Selector that operates on that source.
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The Data Selector will determine what selection
criteria may be applied for selecting the records in that File.
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And then we need to select some Fields. The Fields
provide the Data.
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Now we have a proper Query, which can be executed
or saved for future use.
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