The SQLinDS package is based on Mike Rhoads' article Use the Full Power of SAS in Your Function-Style Macros.
The package allows to write SQL queries in the data step, e.g.
data class;
set %SQL(select name, age from sashelp.class order by age);
run;SHA256 digest for the latest version of SQLinDS: F*606A24A2A6B06DAAD2D443FA9A9819D9564235A5CD8599FD15586F1EFFCB41BC
To work with a package use the SAS Packages Framework.