Sub queries and Triggers

Question

Hey everybody, 
I'm having this problem creating this trigger..
This errors keeps popping up
"Only one expression can be specified in the select list when the subquery is not introduced with EXISTS"
The code is intended to send a message to the seller when the bid is at 95% and the message displays that customer information..
I've tried using EXIST but i'm not sure of the correct syntax to use that 
Can anyone help?
Here is my code:
CREATE TRIGGER msgBID ON BID
FOR INSERT, UPDATE
AS
DECLARE @Price INT
DECLARE @MSG varchar(max)
DECLARE @AskingPrice INT
BEGIN
SET @PRICE=(SELECT PRICE FROM INSERTED)
SET @AskingPrice=(SELECT Asking_Price FROM item, INSERTED WHERE ITEM.ITEMnum=INSERTED.ITEMnum)
IF
@Price <=@AskingPrice *.95
   SET @MSG=(SELECT Inserted.ITEMnum, ITEM.Name, Item.Description, F_Name, L_Name,
Customer.CID FROM ITEM, CUSTOMER, Inserted
   WHERE Inserted.ITEMnum=Item.ITEMnum and Customer.CID=Item.CID and Inserted.CID=Customer.CID
PRINT
@MSG
END

Answer 1

Issue is in when you want to return the message. 
You need to concatenate the values to show up as message. Next, what if there are multiple values changed, what do you want to show as output? Please clarify. 
You can use
STUFF to concatenate multiple outputs while information that you want to show the user they are also combined as single output. 
IF @Price <=@AskingPrice *.95
   SET @MSG=(SELECT 'Item Number: ' + CONVERT(VARCHAR(30), Inserted.ITEMnum) + ' - Item Name: ' + ITEM.Name + ' - ' + ' - Item Desc: ' + Item.Description + ' - First name: ' + F_Name + ' - Last Name: ' + L_Name
+ ' Customer ID: ' + CONVERT(VARCHAR(20), Customer.CID)
FROM 
dbo.Inserted
INNER JOIN dbo.CUSTOMER ON Customer.CID=Item.CID and Inserted.CID=Customer.CID
INNER JOIN dbo.ITEM ON Inserted.ITEMnum=Item.ITEMnum
Also, please try to use
JOIN
Best Wishes, Arbi; Please vote if you find this posting was helpful or Mark it as answered.