Question

How can this error be solved? The code produces an error when @count reaches 1:

There is already an object named ‘did2’ in the database.

I read that I am not allowed to use select into twice in a loop (for whatever reason, in PL/SQL this is a very standard pattern).

BEGIN
DECLARE @count INT
SET @count = 0
WHILE (@count < 200)
BEGIN
    DECLARE @did2 DATETIME
    SELECT DATEADD(ss, @count, '01.01.2002 00:00:00') as did2 into did2 -- throws an error the 2nd time
    INSERT INTO [DbPriceHistorTesty].[dbo].[QuoteHistories]
               ([Id]
               ,[ContractId]
               ,[Open]
               ,[Close]
               ,[Min]
               ,[Max]
               ,[SenderId]
               ,[CreatedAt])
         VALUES (
               @did2
               ,1
               ,1
               ,1
               ,1
               ,1
               ,'1'
               ,GETDATE())
   SET @count = (@count + 1)
END
END

Answer 1

You are creating a table did2 for every rep.

You probably want this instead.

SELECT @did2 = DATEADD(ss, @count, '01.01.2002 00:00:00')

You should also consider changing your dateformat to YYYY-MM-DDTHH:MM:SS.

That way you will not be dependent on local datetime settings.