Question

I need to perform a JOIN on a JOIN-ed table, and I’m not sure how to accomplish it. Hopefully, the query below demonstrates what I’m trying to do: get country names, each country’s leader, and each leader’s home town.

I think the problem with this query is using the JOIN-ed table “President” in the second join with President.HomeTown_Id. I don’t know what else to try.

SELECT 
  Countries.Name AS Country, 
  President.Name AS Leader,
  PresidentHomeTown.Name AS LeaderHomeTown
FROM Countries
  LEFT OUTER JOIN PoliticalFigures AS President ON Countries.President_Id = President.Id
  LEFT OUTER JOIN Cities AS PresidentHomeTown ON President.HomeTown_Id = PresidentHomeTown.Id

In VS, I’m getting the error, “The multi-part identifier “President.Id” could not be bound.”

The names of tables and fields are fictitious, but I need to solve an identical problem. I changed the names to make things clearer; hopefully this will be relevant to more people.

— update —

Maybe the original code helps:

SELECT 
    CaseComparisons.Directory AS CaseComparisonDir, 
    BaselineResult.Directory AS BaselineResultDir, 
    ComparisonResult.Directory AS ComparisonResultDir,
    Setup.FullSvnLink AS SvnLink,
    BaselineVersion.FullFilePath AS BaselineExecutableDir
FROM CaseComparisons 
    LEFT OUTER JOIN Results AS BaselineResult ON CaseComparisons.BaselineResult_Id = Baseline.Id 
    LEFT OUTER JOIN Results AS ComparisonResult ON CaseComparisons.ComparisonResult_Id = Comparison.Id
    LEFT OUTER JOIN Setups AS Setup ON Baseline.Setup_Id = Setups.Id
    LEFT OUTER JOIN BuildVersions AS BaselineVersion ON BaselineResult.Version_Id = BuildVersions.Id
WHERE 
    CaseComparisons.Status = 'Queued' OR 
    Baseline.Status = 'Queued' OR 
    Comparison.Status = 'Queued'

The errors I get when I run the query:

The multi-part identifier "Baseline.Id" could not be bound.
The multi-part identifier "Comparison.Id" could not be bound.
The multi-part identifier "Baseline.Setup_Id" could not be bound.
The multi-part identifier "Setups.Id" could not be bound.
The multi-part identifier "BuildVersions.Id" could not be bound.
The multi-part identifier "Baseline.Status" could not be bound.

Answer 1

You’ve got mismatches between the aliases you’re specifying (e.g. in Results AS ComparisonResult) and the aliases you’re trying to use (e.g. in Comparison.Id). So, change this:

    LEFT OUTER JOIN Results AS ComparisonResult
                 ON CaseComparisons.ComparisonResult_Id = Comparison.Id

to either this:

    LEFT OUTER JOIN Results AS ComparisonResult
                 ON CaseComparisons.ComparisonResult_Id = ComparisonResult.Id

or this:

    LEFT OUTER JOIN Results AS Comparison
                 ON CaseComparisons.ComparisonResult_Id = Comparison.Id

(and similarly for all the other joins).