Question

I’m getting a strange error with the below code. No column was specified for column 2 of 'no1'.
As far as I can tell it should work. I’m simply trying to get a collection of details about customers where the customers exist more than once on the receipts tbl.

SELECT
    CM.ClientID,
    CPN.Birthdate,
    CM.ClientPassword
FROM 
    dbo.ClientMaster AS CM
    JOIN dbo.ClientPerson AS CPN ON (CM.ClientID = CPN.ClientID)
    JOIN dbo.ClientProduct AS CP ON (CPN.ClientID = CP.ClientID)
WHERE 
    CM.ClientID IN (
                    SELECT 
                        no1.ClientID 
                    FROM 
                        (
                        SELECT 
                            CM.ClientID,
                            COUNT(*)
                        FROM 
                            dbo.ClientMaster AS CM
                            JOIN dbo.ClientPerson AS CPN ON (CM.ClientID = CPN.ClientID)
                            JOIN dbo.ClientProduct AS CP ON (CPN.ClientID = CP.ClientID)
                        WHERE
                            CP.PolicyNo IN (SELECT PolicyNo FROM Receipts)
                            AND CM.ClientID IS NOT NULL
                            AND Birthdate IS NOT NULL
                            AND ClientPassword IS NOT NULL
                        GROUP BY
                            CM.ClientID
                        HAVING 
                            COUNT(*)>1
                        ) AS no1
                    )

SOLUTION

Ah did not realise you don’t need the Count(*) in the Select. Thanks guys!
This is what I ended up going with.

SELECT DISTINCT
    CM.ClientID,
    CPN.Birthdate,
    CM.ClientPassword
FROM 
    dbo.ClientMaster AS CM
    JOIN dbo.ClientPerson AS CPN ON (CM.ClientID = CPN.ClientID)
    JOIN dbo.ClientProduct AS CP ON (CPN.ClientID = CP.ClientID)
WHERE 
    CM.ClientID IN (
                        SELECT 
                            ClientID 
                        FROM 
                            Receipts
                        GROUP BY
                            ClientID
                        HAVING 
                            COUNT(*)>1
                        )
    AND CM.ClientID IS NOT NULL
    AND Birthdate IS NOT NULL
    AND ClientPassword IS NOT NULL

Answer 1

Your COUNT(*) column needs a name, like:

 COUNT(*) AS RecordCount