Question

I have a table called Users that stores generic user information (user id, first, last name, email id, phone number, is active, etc.). User Id is primary key.

I have a second table that stores the user’s condo unit numbers (one to many relationship). One user can have one or more condos. User Id is secondary key.

UserID UnitNumber
    1      2A
    1      2B
    2      8H

I have a third table that stores the user’s parking spot numbers (one to many relationship).
One user can have zero or more parking spots. User Id is secondary key.

UserID ParkingSpot
1      104
1      105
1      208
2      205
2      206

How can I write a query that will return the user information plus the condo unit numbers and parking spot numbers for each user?

What I am looking to obtain is something like this:

UserID  FirstName  LastName  Email         Phone         Units    ParkingSpots
1       John       Smith     [e-mail]  123-456-7890  2A, 2B   104, 105, 208
2       Mike       Allen     [e-mail]  456-789-0123  8H       205, 206

Thanks!

Answer 1

You can use the STUFF function

SELECT 
    UserID,
    FirstName,
    LastName,
    Email,
    Phone,
    STUFF((SELECT ',' + n.UnitNumber FROM dbo.Units n WHERE n.UserID = u.UserID FOR XML PATH('')), 1, 1, ''),
    STUFF((SELECT ',' + p.ParkingSpot FROM dbo.Parking p WHERE p.UserID = u.UserID FOR XML     PATH('')), 1, 1, '')
FROM Users u