Eu escrevi sobre isso há um tempo atrás.Extraindo números com servidor SQL
Declare @Temp Table(Data VarChar(100))
Insert Into @Temp Values('some text 456.09 other text')
Insert Into @Temp Values('even more text 98273.453 la la la')
Insert Into @Temp Values('There are no numbers in this one')
Select Left(
SubString(Data, PatIndex('%[0-9.-]%', Data), 8000),
PatIndex('%[^0-9.-]%', SubString(Data, PatIndex('%[0-9.-]%', Data), 8000) + 'X')-1)
From @Temp