Hello together, I installed MonetDB with the help of the latest monetdb-install.sh and played around with MIL. Now I'm stuck with translating a simple SQL-Query containing a GROUPBY. After starting the server with # Mserver --dbname test --dbinit 'module(mapi); mil_start();' and the client with # ./mclient -lmil -utest -dname=test I tried the following: var a:= bat(oid,int); a.insert(1@0, 1995); a.insert(2@0, 1992); a.insert(3@0, 1993); a.insert(4@0, 1994); a.insert(5@0, 1995); a.insert(6@0, 1996); CTgroup(a).print(); the answer is: ERROR: const operation on a BAT ERROR: CMDconstCopy: operation failed. ERROR: interpret_params: print(param 1): evaluation error. Another try after loading the xtables-Module: mil>module("xtables"); mil>CTgroup(a).print(); +-------------------------------------------------------+ | � | +-------------------------------------------------------+ 1 tuple I used a few papers and http://monetdb.cwi.nl/MonetDB/Version4/Documentation/mil/index.html (Chapter 3.7 is what I'm looking for) as tutorial but didn't find anything helpful. Where's my mistake? Best Regards, Hannes