You must give url with the variable to check, e.g:
http://example.xxx/news.php?sec=news&id=1 (valid)
http://example.xxx/news.php (invalid)
it is faster when you know how many (n)columns in the table, e.g:
order by 1,2,3,..,n (n is total columns)
leave it blank when you dont know it
use /* or -- as ending
use /**/ or + as space
