Updateable Function Based SQL Index

[stanlyn]

Hi,

How do I create an updateable index from these index definitions:

CREATE INDEX LibSort ON dbo.Page
(
REPLICATE('0', 5-len(dbo.Page.system_id)) + ltrim(dbo.Page.system_id)+'~'+
REPLICATE('0', 40-len(dbo.Page.Page_Type)) + ltrim(dbo.Page.Page_Type)+'~'+
REPLICATE('0', 24-len(dbo.Page.book_num)) + ltrim(dbo.Page.book_num)+'~'+
REPLICATE('0', 24-len(dbo.Page.Page_Prefix)) + ltrim(dbo.Page.Page_Prefix)+'~'+
REPLICATE('0', 12-len(dbo.Page.Page_num)) + ltrim(dbo.Page.Page_num)+'~'+
REPLICATE('0', 4-len(dbo.Page.SubPage_Num)) + ltrim(dbo.Page.SubPage_Num)
)

By updateable, I mean the index must be automatically updated when crud operations occur.

Thanks, Stanley