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Blank or unique value?
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Forum:
Microsoft SQL Server
Catégorie:
Conception bases de données
Titre:
Blank or unique value?
Divers
Thread ID:
00979508
Message ID:
00979508
Vues:
39
How can I setup a field-level constraint so that the value for a field is either blank or unique? I have a field that the user has to fill-in later with a unique value but the data is initially blank and bunch of records are added in batch mode. TIA.
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