This email is to report a bug in MonetDB V4.8.2 for windows. My name is Rómulo Gonçalves, number 0536601. When I try to create a table with multiply primary key with the following code (SQL99) : CREATE TABLE URLS ( ID_URL int, ID_Division int, PRIMARY KEY (ID_URL, ID_Division) ); ALTER Table URLs ADD foreign key(ID_Division) references URL_Division(ID_Division); I receive the following error: "[MonetDB][ODBC Driver 1.0]! Could not find referenced primary key in table urls" Then I tried with the following code: CREATE TABLE URLS ( ID_URL int, ID_Division int, primary key(ID_URL), primary key(ID_Division) ); And no error happen when I create the table. Here is the bug. The MonetDB accept that we insert more than one key and then it accepts the first (in this case ID_URL) as a primary key. But there is another bug. I can not create relational tables because I need to have a multiply primary key, in this case one tuplo (ID_URL,ID-Division) and for this I need to have the possibility to do like the following example: CREATE TABLE URLS ( ID_URL int, ID_Division int, * PRIMARY KEY (ID_URL, ID_Division) -> MonetDB not accept this way to define multiple primary key.* ); Maybe the report is not a perfect report because is the first time that I report bugs of one System. I hope that you understand the two bugs of MonetDB that I found, if there is something that you do not understand, please contact me. Greets, Rómulo....