However, if you plan to specify the same external file several times in your SAS program, you can allocate the file using a FILENAME statement, a JCL DD statement, or the TSO ALLOCATE command. See ...
Many base procedures require an input SAS data set. You specify the input SAS data set using the DATA= option in the procedure statement, for example, proc print data=emp; If you omit the DATA= option ...
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