Execution Phase (12)

Understanding DATA Step Processing

Execution Phase

As the INPUT statement executes for the second time, the values from the second record are read to the program data vector.

     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---+V

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

Input Statement Executes Again

SAS Data Set Perm.Update

Item IDnum InStock BackOrd Total

Bird Feeder LG088 3 20 23

Item	IDnum	InStock	BackOrd	Total
Bird Feeder	LG088	3	20	23