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    <p>Here's the more complete example that @cmjohns was talking about. It will return 0 if it is empty, -1 if it is missing, and has options to handle deleted observations and where clauses (note that using a where clause can make the macro take a long time on very large datasets). </p> <p><strong>Usage Notes:</strong></p> <p>This macro will return the number of observations in a dataset. If the dataset does not exist then -1 will be returned. I would not recommend this for use with ODBC libnames, use it only against SAS tables.</p> <p>Parameters:</p> <ul> <li>iDs - The <code>libname.dataset</code> that you want to check.</li> <li>iWhereClause (<em>Optional</em>) - A where clause to apply</li> <li>iNobsType (<em>Optional</em>) - Either <code>NOBS</code> OR <code>NLOBSF</code>. See <a href="http://support.sas.com/documentation/cdl/en/lefunctionsref/67960/HTML/default/viewer.htm#p12uchp7hm5h2zn1om2ut816af7h.htm" rel="nofollow">SASV9 documentation</a> for descriptions.</li> </ul> <p><strong>Macro definition:</strong></p> <pre><code>%macro nobs(iDs=, iWhereClause=1, iNobsType=nlobsf, iVerbose=1); %local dsid nObs rc; %if "&amp;iWhereClause" eq "1" %then %do; %let dsID = %sysfunc(open(&amp;iDs)); %end; %else %do; %let dsID = %sysfunc(open(&amp;iDs(where=(&amp;iWhereClause)))); %end; %if &amp;dsID %then %do; %let nObs = %sysfunc(attrn(&amp;dsID,nlobsf)); %let rc = %sysfunc(close(&amp;dsID)); %end; %else %do; %if &amp;iVerbose %then %do; %put WARNING: MACRO.NOBS.SAS: %sysfunc(sysmsg()); %end; %let nObs = -1; %end; &amp;nObs %mend; </code></pre> <p><strong>Example Usage:</strong></p> <pre><code>%put %nobs(iDs=sashelp.class); %put %nobs(iDs=sashelp.class, iWhereClause=height gt 60); %put %nobs(iDs=this_dataset_doesnt_exist); </code></pre> <p><strong>Results</strong></p> <pre><code>19 12 -1 </code></pre> <p><strong>Installation</strong></p> <p>I recommend setting up a <a href="http://support.sas.com/kb/24/451.html" rel="nofollow">SAS autocall library</a> and placing this macro in your autocall location. </p>
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    1. POHow to detect how many observations in a dataset (or if it is empty), in SAS?
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    1. USRobert Penridge
    1. USRobert Penridge
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    1. COHi Rob, I suppose you are an advanced user of SAS, too. I will try out when I understand the code. Thanks all the same, anyway.
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