[Progress Communities] [Progress OpenEdge ABL] Forum Post: RE: DB is not enforcing index uniqueness

  • Thread starter Thread starter Brian K. Maher
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Brian K. Maher

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the unknown value is the absence of any value at all. people commonly think it is a value in and of itself but it isn’t. that is why there can be multiple records in a table with a unique index when the field(s) in the index are set to unknown. Brian Maher Principal Engineer, Technical Support Progress 14 Oak Park | Bedford, MA 01730 | USA phone +1 781 280 3075 www.progress.com

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