[GENERAL] Single Row Table?

[Yateen Joshi]

Hi,   I have got a table which is supposed to contain only one row. It does not have any primary keys defined. So, essentially, when a new insert happens in that table, I would like it (the insert) to fail if there is already a row existing in that table. How can I do that? Can I add any constraints? Or do I need to write a separate trigger for the same?   Thanks and regards,   Yateen V. Joshi