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MS Access Forum / Database Design / July 2005Record Validation Rule
I have a table with 5 Y/N fields. I want to make it required that only one can be checked. I know how to do this at a form level. However, I think that people who build update queries and change data in the table forget to clear out the old field. I want to force this at table level. Is this possible? >I have a table with 5 Y/N fields. I want to make it required that only one >can be checked. I know how to do this at a form level. However, I think >that people who build update queries and change data in the table forget to >clear out the old field. I want to force this at table level. Is this >possible? Well, it violates normal form: fields should NOT be mutually dependent. Might you consider instead using a single Integer field with values 1 to 5? The user interface on a Form could be an Option Box with five checkboxes; only one will be able to be checked. John W. Vinson[MVP] |
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