Hi,
libname MSSQL (path=... /* your connection information */);
proc sql;
insert into MSSQL.DB_DATASET
select * from YOURDATASET;
quit;
Assumes that the YOURDATASET matches the DB_DATASET. Also note you could get duplicates and other issues. Personally I always recommend doing the database part on the database end rather than from another application, you wouldn't for instance, send your email replies from Excel would you?