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SAS/ACCESS Interface to CA-DATACOM/DB: Reference |
An access descriptor contains information about the CA-DATACOM/DB table you want to use. The information includes the table name, the field names, and their data types. You use the access descriptor to create view descriptors. Think of an access descriptor as being a master descriptor file for a single CA-DATACOM/DB table, because it usually contains a complete description of that table.
A view descriptor defines a subset of the data described
by an access descriptor. You choose this subset by selecting particular fields
in the CA-DATACOM/DB table, and you
can specify selection criteria that the data must meet. For example, you
may want to select two fields, LAST-NAME and CITY-STATE, and specify that
the value stored in field CITY-STATE must be
AUSTIN TX
. You can also specify a sequence order for the data. After
you create your view descriptor, you can use it in a SAS program to read data
directly from the CA-DATACOM/DB table
or to extract the data and place them in a SAS data file. Typically, for
each access descriptor that you define, you have several view descriptors,
each selecting different subsets of data.
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