What to do IN BETWEEN dates


I saw a suggestion arrive from a SAS customer who would like to see the IN operator extended to allow ranges of date values. For example, you can currently write a program that checks for values IN a collection or range of numbers:

data check;
  if x in (1:10) then result="match";

This matches on the set of numbers 1 through 10, inclusive. The customer would like to see something like this supported, to match on the dates that fall within a given range.

data check;
   if x in ('01JAN2010'd : '01FEB2010'd) then result="match";

It's a great suggestion. But in the meantime, you can satisfy this simple example by using the shorthand for the AND operator:

data check;
  if '01JAN2010'd <= x <='01FEB2010'd then result="match";

There are many other ways to "skin this cat", including using PROC SQL and the BETWEEN condition. What's your favorite?


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Chris Hemedinger

Senior Manager, SAS Online Communities

+Chris Hemedinger is the manager of SAS Online Communities. Since 1993, Chris has worked for SAS as an author, a software developer, an R&D manager and a consultant. Inexplicably, Chris is still coasting on the limited fame he earned as an author of SAS For Dummies.  He also hosts the SAS Tech Talk webcasts each year from SAS Global Forum, connecting viewers with smart people from SAS R&D and the impressive work that they do.

1 Comment

  1. I assume from the context that x is supposed to be integer-valued. If so, your workaround is fine. However, for non-integer values of x, the two approaches give different results:

    data check;
    input x @@;
    if x in (1:10) then InResult="match"; else InResult="NOT";
    1 1.5 5 7.5 10 11
    proc print; run;

    To robustly mimic the IN operator with the "less than" code, you should check that x is an integer as part of the IF condition:

    if (int(x)=x) & (less-than-comparison-code) then...

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