Ошибка арифметического переполнения sql server

I keep getting this error message everytime I run this query:

Msg 8115, Level 16, State 8, Line 33
Arithmetic overflow error converting numeric to data type numeric.
The statement has been terminated.

But if I change the create table to (7,0), I don’t get the error message.But I need my data to be displayed as a decimal. I have tried 8,3 does not work.

Is there any one who can help me work this?Any help will be greatly appreciated.

DECLARE @StartDate AS DATETIME
DECLARE @StartDate_y AS DATETIME
DECLARE @EndDate AS DATETIME
DECLARE @temp_y AS DATETIME

SET @temp_y = Dateadd(yy, Datediff(yy, 0, Getdate()), 0)
SET @StartDate_y = Dateadd(dd, 1 - Datepart(dw, Dateadd("ww", -2, @temp_y)),
                                      Dateadd("ww", -2, @temp_y))
SET @StartDate = Dateadd(dd, 1 - Datepart(dw, Dateadd("ww", -2, Getdate())),
                                  Dateadd("ww", -2, Getdate()))
SET @EndDate = Dateadd(dd, 6, @StartDate)

--temp table to hold all cities in list
CREATE TABLE ##temp
  (
     city VARCHAR(50)
  )

INSERT INTO ##temp
VALUES     ('ABERDEEN'),
            ('CHESAPEAKE'),
            ('Preffered-Seafood/CHICAGO'),
            ('Preffered-Redist/CHICAGO'),
            ('CLACKAMAS'),
            ('COLUMBUS'),
            ('CONKLIN'),
            ('DENVER'),
            ('FORT WORTH'),
            ('HANOVER PARK'),
            ('JACKSONVILLE'),
            ('LAKELAND'),
            ('MONTGOMERY'),
            ('PFW-NORTHEAST'),
            ('PFW-SOUTHEAST'),
            ('RIVERSIDE'),
            ('TRENTON,CANADA'),
            ('VERNON')

--temp to hold data for the cities
CREATE TABLE #temp
  (
     city            VARCHAR(50),
     ytdshipments    INT,
     ytdtotalweight  DECIMAL(7, 2) NOT NULL,
     ytdtotalcharges DECIMAL (7, 2) NOT NULL
  --YTDRevperPound decimal (7,2) not null
  )

INSERT INTO #temp
SELECT ##temp.city,
       0,
       0,
       0
FROM   ##temp

INSERT #temp
-- YTD shipments/Charges/Weight by city
SELECT city = CASE
                WHEN nameaddrmstr_1.city IN( 'ABERDEEN', 'CHESAPEAKE', 'CHICAGO'
                                             ,
                                             'CLACKAMAS',
                                             'COLUMBUS', 'CONKLIN', 'DENVER',
                                             'FORT WORTH',
                                             'HANOVER PARK', 'JACKSONVILLE',
                                             'LAKELAND'
                                             ,
                                             'MONTGOMERY'
                                                    ,
                                             'RIVERSIDE', 'TRENTON', 'VERNON' )
              THEN
                CASE
                  WHEN
              nameaddrmstr_1.city = 'CHICAGO'
              AND h.shipr = 'PREFRESVS' THEN 'Preffered-Redist/CHICAGO'
                WHEN
              nameaddrmstr_1.city = 'TRENTON'
              AND nameaddrmstr_1.city = 'CA' THEN 'TRENTON,CANADA'
                ELSE
              nameaddrmstr_1.city
                END
                ELSE 'Other'
              END,
       ytdshipments = COUNT(CONVERT(VARCHAR(10), h.dateshipped, 101)),
       ytdtotalweight =SUM(CASE
                             WHEN h.totaldimwgt > h.totalwgt THEN h.totaldimwgt
                             ELSE h.totalwgt
                           END),
       ytdtotalcharges = SUM (cs.totalestrevcharges)
--YTDRevperPound = convert(decimal(7,2),sum (cs.TotalEstRevCharges )/sum( CASE WHEN h.TotalDimWGT > > h.TotalWGT THEN h.TotalDimWGT ELSE h.TotalWGT END ))
FROM   as400.dbo.hawb AS h WITH(nolock)
       INNER JOIN as400.dbo.chargesummary AS cs
         ON h.hawbnum = cs.hawbnum
       LEFT OUTER JOIN as400.dbo.nameaddrmstr AS nameaddrmstr_1
         ON h.shipr = nameaddrmstr_1.nameaddrcode
WHERE  h.dateshipped >= '01/01/2010'
       AND h.dateshipped <= '12/19/2010'
       --WHERE H.DateShipped >= >= @StartDate_y AND H.dateshipped <= @EndDate 
       AND h.cust IN( 'DARDENREED', 'MAINEDARDE', 'MBMRIVRSDE', 'MBMCOLUMBS',
                      'MBMLAKELND', 'MBMFTWORTH', 'SYGMACOLUM', 'SYGMANETW6',
                      'MAI215', 'MBMMNTGMRY' )
GROUP  BY CASE
  WHEN nameaddrmstr_1.city IN( 'ABERDEEN', 'CHESAPEAKE', 'CHICAGO', 'CLACKAMAS',
                               'COLUMBUS', 'CONKLIN', 'DENVER', 'FORT WORTH',
                               'HANOVER PARK', 'JACKSONVILLE', 'LAKELAND',
                               'MONTGOMERY'
                                      ,
                               'RIVERSIDE', 'TRENTON', 'VERNON' ) THEN CASE
                                                                         WHEN
nameaddrmstr_1.city = 'CHICAGO'
AND h.shipr = 'PREFRESVS' THEN 'Preffered-Redist/CHICAGO'
                                                                         WHEN
nameaddrmstr_1.city = 'TRENTON'
AND nameaddrmstr_1.city = 'CA' THEN 'TRENTON,CANADA'
                                                                         ELSE
nameaddrmstr_1.city
                                                                       END
  ELSE 'Other'
END

SELECT #temp.city                 AS city,
       MAX(#temp.ytdshipments)    AS ytdshipments,
       MAX(#temp.ytdtotalweight)  AS ytdtotalweight,
       MAX(#temp.ytdtotalcharges) AS ytdtotalcharges
FROM   #temp WITH(nolock)
       LEFT OUTER JOIN ##temp
         ON ##temp.city = #temp.city
GROUP  BY #temp.city

DROP TABLE #temp

DROP TABLE ##temp  

Может довольно простой вопрос.
Но хотелось бы узнать механизм работы.
Почему

SELECT 2000000000 * 3 
--Ошибка арифметического переполнения при преобразовании expression к типу данных int.

SELECT 3000000000 * 3  
-- 9000000000

Если создать вью

create view ts
as 

SELECT 2000000000 * 3 AS A, 3000000000 * 3  AS B

, то в типах данных увидим такое