sql - hash several strings tsql -


i trying create unique hash this:

select     cast(hashbytes('sha1',          ltrim(rtrim(isnull('9',''))) +          ltrim(rtrim(isnull('x',''))) +          ltrim(rtrim(isnull('',''))) +          ltrim(rtrim(isnull('y',''))) +          ltrim(rtrim(isnull('','')))) varbinary(20))  select     cast(hashbytes('sha1',          ltrim(rtrim(isnull('9',''))) +          ltrim(rtrim(isnull('x',''))) +          ltrim(rtrim(isnull('y',''))) +          ltrim(rtrim(isnull('',''))) +          ltrim(rtrim(isnull('','')))) varbinary(20))

unfortunately, end same hash despite different strings. ideas why?

ps:

this solves above 'issue':

select  ltrim(rtrim(isnull('9', '-'))) + n',' + ltrim(rtrim(isnull('x', '-')))         + n',' + ltrim(rtrim(isnull('', '-'))) + n',' + ltrim(rtrim(isnull('y',                                                               '-'))) + n','         + ltrim(rtrim(isnull('', '-'))) ,         cast(hashbytes('sha1',                        ltrim(rtrim(isnull('9', '-'))) + n','                        + ltrim(rtrim(isnull('x', '-'))) + n','                        + ltrim(rtrim(isnull('', '-'))) + n','                        + ltrim(rtrim(isnull('y', '-'))) + n','                        + ltrim(rtrim(isnull('', '-')))) varbinary(20))  select  ltrim(rtrim(isnull('9', '-'))) + n',' + ltrim(rtrim(isnull('x', '-')))         + n',' + ltrim(rtrim(isnull('y', '-'))) + n',' + ltrim(rtrim(isnull('',                                                               '-'))) + n','         + ltrim(rtrim(isnull('', '-'))) ,         cast(hashbytes('sha1',                        ltrim(rtrim(isnull('9', '-'))) + n','                        + ltrim(rtrim(isnull('x', '-'))) + n','                        + ltrim(rtrim(isnull('y', '-'))) + n','                        + ltrim(rtrim(isnull('', '-'))) + n','                        + ltrim(rtrim(isnull('', '-')))) varbinary(20))

because there not different strigns:

    ltrim(rtrim(isnull('9',''))) +      ltrim(rtrim(isnull('x',''))) +      ltrim(rtrim(isnull('',''))) +      ltrim(rtrim(isnull('y',''))) +      ltrim(rtrim(isnull('',''))))       -- same of      ltrim(rtrim(isnull('9',''))) +      ltrim(rtrim(isnull('x',''))) +      ltrim(rtrim(isnull('y',''))) +      ltrim(rtrim(isnull('',''))) +      ltrim(rtrim(isnull('',''))))       -- same of      '9xy'

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