Dropping foreign key constraint

Hello together, I’m very new to MonetDB, so please be gracious :) I’m trying to drop a foreign key, what should be a very simple task – but I didn’t manage to do it. The following statement ran successfully – as the result says – but the foreign key is still there: alter table visit drop constraint visit_configuration_id_fkey; I also tried this – but this command is not supported?? alter table visit drop foreign key visit_configuration_id_fkey; An error occurred when executing the SQL command: alter table visit drop foreign key visit_configuration_id_fkey syntax error, unexpected FOREIGN in: "alter table visit drop foreign" [SQL State=42000] Execution time: 0.01s 1 statement failed. Best regards and thanks for any hints, Alex