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I got this error while i am trying to start the SQLSERVERAGENT( SQLSERVER 2000 )from services(services.msc).If i right Click and trying to start the service i am getting this error. Solution for this is : Go to Properties of SQLServerAgent->Connections->Check SQL ServerAuthentication->Choose Logins from dropdownlist and he should be the member of sysadmin role.Click Ok. Then SQL Server Agent will start

Here i am writing about derived query when we can use, and why I am writing a query which gives me results as Total Emails went to one particular Person(Here we can consider FirstName,LastName) And i am going to get these requirement by using GROUP BY Normally we have to use all columns whatever we mentioned in the SELECT statement.We have to mention all the columns in GROUP BY also. But i want to get the result using FirstName,LastName in GROUP BY. But it is not possible if you have many columns along with FirstName and LastName in Select Query.We have to give all the columnnames. But by using DerivedQuery we can use this Find below Query. SELECT Y.*,X.cnt FROM ( select count(1) cnt, ISnull(Table2.FirstName,'') as FirstName ,isnull(Table2.LastName,'') AS LastName FROM Table1 INNER JOIN Table2 ON Table1.emailID = Table2.EmailID LEFT OUTER JOIN Table3 AS Table3 ON Table1.EmailID=Table3.EmaiID WHERE 1=1 GROUP BY ISnull(Table2.FirstName,'') ,i