I would like to define a new column in a table give it a default value of 0. Easy enough. But I only want the column to store either 0 or 100 and nothing else. Should I invoke an inert/update trigger or define a UDEF? How would this be done. I have not had luck finding examples of this or in the help files. I would appreciate an example or if someone can point me to some references that explain how to set this up? Thanks for any help.