fact: Definition UniqueAttribute' {heading : RawHeading} attr (tup1 tup2 : @RawTuple heading) := GetAttributeRaw tup1 attr <> GetAttributeRaw tup2 attr.
imports: Coq.Lists.List Coq.Strings.String Coq.Logic.FunctionalExtensionality Coq.Sets.Ensembles Fiat.Common.StringBound Fiat.QueryStructure.Specification.Representation.Notations Fiat.QueryStructure.Specification.Representation.Heading Fiat.QueryStructure.Specification.Representation.Tuple