Question

I need help to write a simple procedure. Let me explain what I’m trying to do.

I have 3 tables

1. tJobOffer
2. tApplication
3. tApplicationStatus

I would like to create a procedure that return me a list of tJobOffer with the number of candidate that responded to this tJobOffer. Candidate is a status of my table tApplicationStatus. This table is linked to tApplication that is linked to tJobOffer. An application can be CANDIDATE / ACCEPTED / REFUSED / IGNORED / …

I created this query :

    SELECT 
        [T].[JobOfferId],
        [T].[JobOfferTitle],
        COUNT([A].[ApplicationId]) AS [CandidateCount]

    FROM        [tJobOffer] AS [T]
    LEFT JOIN   [tApplication] AS [A]
        ON      [A].[JobOfferId] = [T].[JobOfferId]
    LEFT JOIN   [tApplicationStatus] AS [S]
        ON      [S].[ApplicationStatusId] = [A].[ApplicationStatusId]
        AND     [S].[ApplicationStatusTechnicalName] = 'CANDIDATE'

    GROUP BY
            [T].[JobOfferId],
            [T].[JobOfferTitle]
            --[A].[ApplicationStatusId]

    ORDER BY [T].[JobOfferTitle]

The result is

> 52ED7C67-21E1-49BB-A1F8-0601E6EED1EA  Annonce 1   0
> F26B228D-0C81-4DA8-A287-F8F997CC1F9C  Annonce 1b  0
> 9DA60B23-F113-4C7F-9707-2B90C1556D5D  Announce 25 2
> 258E11A7-79C1-47B6-8C61-413AA54E2360  Announce 3  0
> DA582383-5DF4-4E1D-837C-382371BDEF57  Announce 6  2

This is not correct because I only have 1 candidate for Announce 6. If a set my line

    --AND     [S].[ApplicationStatusTechnicalName] = 'CANDIDATE'

in comment the result is the same. My query seems to ignore this line. What is wrong?

EDIT —

My correct result should be

> 52ED7C67-21E1-49BB-A1F8-0601E6EED1EA  Annonce 1   0
> F26B228D-0C81-4DA8-A287-F8F997CC1F9C  Annonce 1b  0
> 9DA60B23-F113-4C7F-9707-2B90C1556D5D  Announce 25 2
> 258E11A7-79C1-47B6-8C61-413AA54E2360  Announce 3  0
> DA582383-5DF4-4E1D-837C-382371BDEF57  Announce 6  1

Answer 1

I guess you want this:

SELECT 
    [T].[JobOfferId],
    [T].[JobOfferTitle],
    COUNT([A].[ApplicationId]) AS [CandidateCount]

FROM        [tJobOffer] AS [T]
LEFT JOIN   [tApplication] AS [A]
    INNER JOIN  [tApplicationStatus] AS [S]
        ON      [S].[ApplicationStatusId] = [A].[ApplicationStatusId]
        AND     [S].[ApplicationStatusTechnicalName] = 'CANDIDATE'
    ON      [A].[JobOfferId] = [T].[JobOfferId]

GROUP BY
        [T].[JobOfferId],
        [T].[JobOfferTitle]

ORDER BY [T].[JobOfferTitle] ;

You could also join first the 2 “Application” tables, group by and then join the derived table with JobOffer:

SELECT 
    [T].[JobOfferId],
    [T].[JobOfferTitle],
    COALESCE([G].[Cnt], 0) AS [CandidateCount]

FROM        [tJobOffer] AS [T]
LEFT JOIN   
            ( SELECT 
                  [A].[JobOfferId],
                  COUNT(*) AS [Cnt]

              FROM        [tApplication] AS [A]
              INNER JOIN  [tApplicationStatus] AS [S]
                  ON      [S].[ApplicationStatusId] = [A].[ApplicationStatusId]
                  AND     [S].[ApplicationStatusTechnicalName] = 'CANDIDATE'

              GROUP BY
                          [A].[JobOfferId]
            ) AS [G]
    ON      [G].[JobOfferId] = [T].[JobOfferId]

ORDER BY [T].[JobOfferTitle] ;