TSQL script - to Find ByteSize of All the Tables in Database

SELECT CASE WHEN (GROUPING(sob.name)=1THEN 'All_Tables'
     
ELSE ISNULL(sob.name'unknown'END AS Table_name
,
     
SUM(sys.lengthAS 
Byte_Length

FROM sysobjects sobsyscolumns sys
WHERE sob.xtype='u' AND sys.id=sob.id
GROUP BY sob.name
WITH CUBE



Reference : Pinal Dave (http://blog.SQLAuthority.com)

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