Question

I have Message table in which “senderid” and “receiverid”exists.
I have User table in which username of each user is found.

Now I want to make a stored procedure in which I select the username where userid=senderid and username in which userid=receivername.

I tried this but it’s wrong, coz I never made something like this before.

SELECT       SystemUser.SU_Username Where SystemUser.SU_ID=MessageReciever As RecieverName, SystemUser.SU_Username where Message.SenderID = SystemUser.SU_ID As SenderName FROM            Message CROSS JOIN
                     SystemUser

Is there a method to do what I want?

Answer 1

Select from the SystemUser table twice, with table aliases:

SELECT       SUR.SU_Username  As RecieverName
           , SUS.SU_Username As SenderName 
FROM            Message 
               JOIN SystemUser SUR
                  on (SUR.SU_ID = Message.MessageReciever )
               JOIN SystemUser SUS
                  on (SUS.SU_ID = Message.SenderID )