Each record in the file
Data97 contains a sales representative's ID number, followed by four
repeating fields that represent his or her quarterly sales totals
for 1997. You want to pair each employee ID number with one quarterly
sales total to produce a single observation. Four observations are
generated from each record.
Figure 21.17 Multiple Fields for the Same ID
To accomplish this,
you must execute the DATA step once for each record, repetitively
reading and writing values in one iteration.
This means that a DATA step must do the ...