Sql join, 2 tables, same fields

Question

I have 2 tables. To simplify:

Table 1, users:

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userId int, userName nvarchar(50)

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Table 2 , messages:

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msgId int, msgFrom int,

Answer 1

You need to join onto tabUsers twice. One to get the sender, one to get the recipient:

SELECT m.*, f.userName as Sender, t.userName as Recipient 
FRPOM tabMessages AS m
    INNER JOIN tabUsers AS f on m.msgFrom = f.userId
    INNER JOIN tabUsers AS t on m.msgTo = t.userId 
WHERE m.msgId = @someParameter;