Loop through multiple libraries

[Linzhang426]

Wonder if any experts can help.
I have hundreds of libraries with databases of same names in each library. My libraries are organized by dates for each month each year, such as /xxx/202301, /xxx/202302 etc.
what I need is to run a simple query against some databases within each library, but have to loop through all libraries of my choice to get data statistics. I wonder if there is a way to use a variable to do the loop, and then associate the variable with the library names.

Thanks much for your expert advice!

[yabwon]

What do you mean by a "database" - do you mean a single SAS dataset , or a group of datasets. 

If you mean single dataset. Does the dataset has one common name? Or are they different?

[EDIT:] Does the "xxx" means one common root directory ?

Bart

[Kurt_Bremser]

Do you need to combine source data and run the analysis once, or run the complete analysis for each library, with separate results?

[Tom]

You say LIBRARIES in your subject line.  But in your text you appear to be talking about directories.

Do you have libref's defined that point to each of those directories?

Are you talking about SAS datasets in those different directories?  What are the names of the datasets?

When you have datasets in many different directories sometimes it is easier to use the actual physical name of the dataset file instead of going to the trouble of defining a series of librefs.

data all_2023;
  set "/xxx/202301/somedata.sas7bdat"
      "/xxx/202302/somedata.sas7bdat"
      "/xxx/202303/somedata.sas7bdat"
      "/xxx/202304/somedata.sas7bdat"
      "/xxx/202305/somedata.sas7bdat"
      "/xxx/202306/somedata.sas7bdat"
      "/xxx/202307/somedata.sas7bdat"
      "/xxx/202308/somedata.sas7bdat"
      "/xxx/202309/somedata.sas7bdat"
      "/xxx/202310/somedata.sas7bdat"
      "/xxx/202311/somedata.sas7bdat"
      "/xxx/202312/somedata.sas7bdat"
  ;
run;

If there is a PATTERN to the names of the directories then you can use code to generate the directory names.  For example if you wanted to generate the six digit string representing months in YYYYMM style then you could use a DO loop like this:

basedate = '01JAN2023'd;
do offset=0 to 11 ;
  date = intnx('month',basedate,offset);
  yymm = put(date,yymmn6.);
end;

Which if you needed that in macro code might look like:

%let basedate = '01JAN2023'd;
%do offset=0 %to 11 ;
  %let date = %sysfunc(intnx(month,&basedate,&offset));
  %let yymm = %sysfunc(putn(&date,yymmn6.));
%end;