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These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

/* Create sample data set with index on ITEM */

data veggies(index=(item));
  input Item $ Inventory ;
datalines;
Corn 12
Lettuce 6
Potato 15
Onion 7
;

/* Create transaction data set */

data new_inventory;
  input Item $ Quantity;
datalines;
Lettuce 2
Onion 7
Lettuce 3
;

/* There is no automatic update of like named variables with KEY=. */
/* If the goal is to accumulate the values of INVENTORY instead of */
/* overwriting them, an accumulation statement is needed.          */

data veggies;
  set new_inventory;
  modify veggies key=Item/unique;
  select (_iorc_);
    when (%sysrc(_sok)) do;

      /* To accumulate instead of overwrite */
      inventory=inventory + quantity ;
      replace;
    end;
    when (%sysrc(_dsenom)) do;
      _ERROR_=0;
      inventory=.;
      put 'no match' inventory=;
      put "Item not in stock --- " Item;
    end;
    otherwise do;
      put 'Unexpected ERROR: _iorc_= ' _iorc_;
      stop;
    end;
  end;
run;

proc print data=veggies;
run;

---

These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

Obs    Item       Inventory

 1     Corn           12
 2     Lettuce        11
 3     Potato         15
 4     Onion          14

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