Add a validation rule to a table
Microsoft Access
You can add a field validation rule and/or a record validation rule. A field validation rule checks input to a field, and is applied when the focus leaves the field. A record validation rule checks input to one or more fields is applied when the focus leaves the record. Usually, a record validation rule compares the values of two or more fields.
Notes: The following field types do not support validation rules:
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AutoNumber
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OLE Object
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Attachment
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ReplicationID
OR
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