How Can I Calculate Table Size ?

Jan 29, 2008

this is the table i have created .

CREATE TABLE [dbo].[Table] (
[BCode] [varchar] (3) ,
[RefNo] [varchar] (12) ,
[RType] [varchar] (2) ,
[TheirRef] [varchar] (50) ,
[Amount] [money] NULL ,
[AccountNo] [varchar] (20) NULL ,
[EnteredDate] [datetime] NULL ,
[EnteredBy] [varchar] (6) ,
[IsTrue] [varchar] (1) ,
[RDate] [datetime] NULL ,
[Details] [varchar] (255) ,
[PostBy] [varchar] (6) ,
[SeqNo] [int] IDENTITY (1, 1) ,
[ThisCode] [varchar] (3) ,
[VDate] [datetime] NULL ,
[Id] [varchar] (20) ,
[Flag] [varchar] (1) ,
[TDate] [datetime] NULL ,
[Type] [char] (1) ,
[SerialNo] [int] NULL
) ON [PRIMARY]
GO

if i insert a single row in a table with values :

INSERT INTO [Table]
SELECT '100','1','DD',1000000,'999999000',
'2008-01-29','sa','F','2008-01-29','PARTIAL DATA','11502',
'101','2008-01-29','ABC1111111','T','2008-01-29','S','11204'

EXECUTE sp_spaceused 'Table'

name | rows |reserved | data |index_size | unused
[Table] | 1 |16KB | 8KB | 8KB | 0KB

i couldnot understand
i) how the system calculate this 16 KB and 8 KB ?
ii) if i changed the VARCHAR(255) to VARCHAR(50) ,will there be difference in size of the table ,if so then how ?
iii) how can i see the change in size of table by reducing the size of datatype ?

can anybody help me ?

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Hi all!

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