Getting number of observations in a dataset

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Getting number of observations in a dataset

HI all,

I have a dataset a_counts, If it has 0 observations, I have to skip a few steps. 

/*Open dataset*/

myDS=%sysfunc(open(a_counts,i));

/*Get number of observations*/
iswhere=%sysfunc(attrn(&myDS,nobs));

*/DO a few steps if there is data*/
&ISWHERE ne 0 %then %do;

     ----

     ----

     ----

%end;

But this is giving me the following error:

You cannot open WORK.A_COUNTS.DATA for output access with member-level control because WORK.A_COUNTS.DATA is in use by you in resource environment DMS Process.

Please advise.

Thanks,

Archana


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‎06-11-2015 06:03 PM
Super User
Posts: 11,343

Re: Getting number of observations in a dataset

Posted in reply to ArchanaSudhir

Another way to get the same info without opening (and possibly forgetting to close a data set):

proc sql noprint;

   select nobs into : iswhere

   from dictionary.tables

   where libname='WORK' and memname='A_COUNTS';

quit;

Note that the Libname and Memname must be in upper case OR use the upcase function on the literal value.

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Trusted Advisor
Posts: 1,934

Re: Getting number of observations in a dataset

Posted in reply to ArchanaSudhir

You have somehow opened this dataset previously in your SAS session. You either need to close this dataset for your code to work, or close SAS and restart SAS.

Solution
‎06-11-2015 06:03 PM
Super User
Posts: 11,343

Re: Getting number of observations in a dataset

Posted in reply to ArchanaSudhir

Another way to get the same info without opening (and possibly forgetting to close a data set):

proc sql noprint;

   select nobs into : iswhere

   from dictionary.tables

   where libname='WORK' and memname='A_COUNTS';

quit;

Note that the Libname and Memname must be in upper case OR use the upcase function on the literal value.

Super User
Posts: 7,868

Re: Getting number of observations in a dataset

Posted in reply to ArchanaSudhir

You most probably have the dataset opened in a file window. Close that first.

Another method for obtaining the record count:

data _null_;

call symput('lastobs',put(lastobs,best.));

set a_counts nobs=lastobs;

run;

Now &lastobs will hold the number of observations in your dataset. Note the ordering of statements in the data step, which is crucial for it to work when the dataset has zero observations.

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