SQL Inner-join with 3 tables

0 votes

Here is the scenario I'm trying to link 3 tables in a view:

Students that are applying to live on this college campus are included in a table I have. Another table in my database contains the three hall preferences for each student. However, each of these preferences is only an ID Number, and in a third table, the ID Number corresponds to a Hall Name (did not design this database...).

I basically have an INNER JOIN on the table containing their information and preferences, and the outcome is...

 John Doe | 923423 | Incoming Student | 005

Where 005 would be the HallID. So Now I want to match that HallID to a third table, where this table contains a HallID and HallName.

So pretty much, I want my result to be like...

 John Doe | 923423 | Incoming Student | Foley Hall <---(INSTEAD OF 005)

Can someone please help me solve this?

Sep 13, 2022 in Database by Kithuzzz
• 38,010 points
846 views

1 answer to this question.

0 votes

Try this:

SELECT s.studentname
    , s.studentid
    , s.studentdesc
    , h.hallname
FROM students s
INNER JOIN hallprefs hp
    on s.studentid = hp.studentid
INNER JOIN halls h
    on hp.hallid = h.hallid

You could do it in this fashion if you wanted multiple halls. For each room pref id, you simply join on your Hall table numerous times.

SELECT     s.StudentID
    , s.FName
    , s.LName
    , s.Gender
    , s.BirthDate
    , s.Email
    , r.HallPref1
    , h1.hallName as Pref1HallName
    , r.HallPref2 
    , h2.hallName as Pref2HallName
    , r.HallPref3
    , h3.hallName as Pref3HallName
FROM  dbo.StudentSignUp AS s 
INNER JOIN RoomSignUp.dbo.Incoming_Applications_Current AS r 
    ON s.StudentID = r.StudentID 
INNER JOIN HallData.dbo.Halls AS h1 
    ON r.HallPref1 = h1.HallID
INNER JOIN HallData.dbo.Halls AS h2
    ON r.HallPref2 = h2.HallID
INNER JOIN HallData.dbo.Halls AS h3
    ON r.HallPref3 = h3.HallID

I hope this helps you.

answered Sep 15, 2022 by narikkadan
• 63,700 points

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