Question

I have two tables:

Table Users

UserId     Name
1          John
2          Alice
3          Tom
4          Charles

and

Table Clients

Id         Name1          Name2      Name3
1            1              3          4
2            2              1          3

I would like to make a SQL query where for

Clients.Id = 1

the results are like:

Id         Name1          Name2       Name3
1          John            Tom       Charles

Using INNER JOIN I am able to do that for each column from Clients but not for the whole record (all three columns).

Answer 1

You need to join table users thrice on table client.

SELECT  a.ID,
        b.name name1,
        c.name name2,
        d.name name3
FROM    clients a
        INNER JOIN users b
            ON a.name1 = b.userID
        INNER JOIN users c
            ON a.name2 = c.userID
        INNER JOIN users d
            ON a.name3 = d.userID
WHERE   a.ID = 1

SQLFiddle Demo