Question

So I have two databases that have no relationship between them. The first one is where my dbo.Clients exists and has a column of the database name of the second db . My thought was to select the dbName from the Clients then use that variable to select data from the second database.
The query doesnt run can some one shed a little light? Thanks.

    @dbName varchar(50) OUTPUT,
@clientID varchar(50)
AS
BEGIN
    SET NOCOUNT ON;
    -- Insert statements for procedure here
    SELECT * FROM sql02.iproconfig4.dbo.Clients 
    SET @dbName = (SELECT Clients.ClientDatabase FROM sql02.iproconfig4.dbo.Clients WHERE ClientID = @clientID) 
    SELECT * FROM [e-mail]   
END

Answer 1

You will need to use dynamic SQL to accomplish this:

DECLARE @sql nvarchar(max)
SET @sql = 'SELECT * FROM sql02.' + @dbName + '.dbo.Discovery'
EXEC sp_executesql @sql