| Understanding DATA Step Processing |
| Execution
Phase |
| After the DATA step is compiled, it is ready for execution. During the execution phase, the data portion of the data set is created. The data portion contains the data values. |
During execution, each observation in the input data set is processed,
stored in the program data vector, and then written to the new data set as
an observation, unless otherwise directed. The DATA step executes once for
each observation in the input data set, unless otherwise directed. For example,
this DATA step reads values from the file Invent and executes
nine times because there are nine records in the file.
data perm.update;
infile invent;
input Item $ 1-13 IDnum $ 15-19
InStock 21-22 BackOrd 24-25;
total=instock+backord;
run;
|
Raw Data File Invent
| 1---+----10---+----20---+- |
| Bird Feeder LG088 3 20 |
| 6 Glass Mugs SB082 6 12 |
| Glass Tray BQ049 12 6 |
| Padded Hangrs MN256 15 20 |
| Jewelry Box AJ498 23 0 |
| Red Apron AQ072 9 12 |
| Crystal Vase AQ672 27 0 |
| Picnic Basket LS930 21 0 |
| Brass Clock AN910 2 10 |
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Copyright © 2002 SAS Institute Inc.,
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