Question

Why doesn’t this query work?

SELECT ROW_NUMBER() OVER (
        ORDER BY DocumentID
        ) peta_rn
    , d.DocumentID
    , d.IsReEfiled
    , d.IGroupID
    , d.ITypeID
    , d.RecordingDateTime
    , dbo.GetLatestStatusDateTime(d.DocumentID) AS LatestStatusDatetime
    , dbo.FnCanChangeDocumentStatus(d.DocumentStatusID, d.DocumentID) AS CanChangeStatus
    , d.IDate
    , d.InstrumentID
    , d.DocumentStatusID
    , ig.Abbreviation AS IGroupAbbreviation
    , u.Username
    , j.JDAbbreviation
    , inf.DocumentName
    , it.Abbreviation AS ITypeAbbreviation
    , d.DocumentDate
    , ds.Abbreviation AS DocumentStatusAbbreviation
    , dbo.GetFlatDocumentName(d.DocumentID) AS FlatDocumentName
FROM Documents d
INNER JOIN IGroupes ig
    ON d.IGroupID = ig.IGroupID
LEFT JOIN ITypes it
    ON d.ITypeID = it.ITypeID
LEFT JOIN Users u
    ON u.UserID = d.UserID
LEFT JOIN DocumentStatuses ds
    ON d.DocumentStatusID = ds.DocumentStatusID
LEFT JOIN InstrumentFiles inf
    ON d.DocumentID = inf.DocumentID
INNER JOIN Jurisdictions j
    ON j.JurisdictionID = d.JurisdictionID
WHERE 1 = 1

whereas this one works:

SELECT ROW_NUMBER() OVER (
        ORDER BY d.DocumentID
        ) peta_rn
    , d.DocumentID
    , d.IsReEfiled
    , d.IGroupID
    , d.ITypeID
    , d.RecordingDateTime
    , dbo.GetLatestStatusDateTime(d.DocumentID) AS LatestStatusDatetime
    , dbo.FnCanChangeDocumentStatus(d.DocumentStatusID, d.DocumentID) AS CanChangeStatus
    , d.IDate
    , d.InstrumentID
    , d.DocumentStatusID
    , ig.Abbreviation AS IGroupAbbreviation
    , u.Username
    , j.JDAbbreviation
    , inf.DocumentName
    , it.Abbreviation AS ITypeAbbreviation
    , d.DocumentDate
    , ds.Abbreviation AS DocumentStatusAbbreviation
    , dbo.GetFlatDocumentName(d.DocumentID) AS FlatDocumentName
FROM Documents d
INNER JOIN IGroupes ig
    ON d.IGroupID = ig.IGroupID
LEFT JOIN ITypes it
    ON d.ITypeID = it.ITypeID
LEFT JOIN Users u
    ON u.UserID = d.UserID
LEFT JOIN DocumentStatuses ds
    ON d.DocumentStatusID = ds.DocumentStatusID
LEFT JOIN InstrumentFiles inf
    ON d.DocumentID = inf.DocumentID
INNER JOIN Jurisdictions j
    ON j.JurisdictionID = d.JurisdictionID
WHERE 1 = 1

As you can see the only difference is I specify d.DocumentID. Is there anyway I can avoid having to specify d.DocumentID and instead specify only DocumentID without using an extra Select? because after all, all documentID refer to the same value.

Answer 1

The problem is that DocumentID is in both tables InstrumentFiles and Documents, so how would the query engine know which one you are referring to?

So in short, No, you have to specify d.DocumentID in this instance.