Question

[1] SELECT X.id FROM somwhere WHERE X.location = _stringReturnedFromC#_
            // I need ID from this table, I only know strin: Location (from C#)

[2] SELECT Y.NameID FROM _relationBetweenXandY_ xy WHERE xy.ID = [1]
           // I use the ID I just found in [1]

[3] SELECT Z.Name FROM Z WHERE Z.NameID = [2]
           // I use the ID I found in [2]

Now how can I tell select [2] that I am looking for xy.ID = result from select [1]

And select [3] that I’m looking for the name of the guy with the ID Z.NameID

I asked this question here but as far as I’m concerned that question is beyond saving.

Z table: 
      Z.Name, Z.NameID
Y Table: 
      Y.PLACE, Y.PlaceID // fixed, Used to be PlaceID, is inface string: Place
X Table:
      X.Name, X.PlaceID

If they have the same name, they are foreign keys (NameID, PlaceID)

This is how the actual code looks like:

SELECT * FROM Angajati a
JOIN Distribuire d ON d.Locatie = 'Oradea'
// now I need to get d.DistribuireID while I know d.Locatie (d.location). How ?
JOIN Angajari an ON d.DistribuireID = an.DistribuireID

Thus

SELECT *
FROM TableX X 
   JOIN TableY y on x.PlaceId = y.PlaceId
   JOIN TableZ z on y.NameId = z.NameId

Does not work because I don’t know Y.PlaceID, I just know Y.Place

LAST EDIT

Sorry if this is getting too long. Here is how it should look like (what I mean by that, even if the syntax won’t work, this is the logic) Now I just need the syntax for this!

SELECT d.DistribuireID FROM Distribuire d WHERE d.Locatie = 'Oradea'
JOIN Angajari an ON an.DistribuireID = d.DistribuireID /*Here I'd need an.AngajatID for the locationID I just selected*/
JOIN Angajati a ON a.AngajatID = an.AngajatID

Answer 1

Looks like you just need some INNER JOINs:

SELECT *
FROM TableX X 
   JOIN TableY y on x.PlaceId = y.PlaceId
   JOIN TableZ z on y.NameId = z.NameId

Hope this helps.

-EDIT — Why won’t this work? Sorry if I’m not understanding your question…

SELECT d.DistribuireID 
FROM Distribuire d 
   JOIN Angajari an ON an.DistribuireID = d.DistribuireID
   JOIN Angajati a ON a.AngajatID = an.AngajatID
WHERE d.Locatie = 'Oradea'

Good luck.