Highest, lowest, and zero removal

Hi everybody...
I am getting varchar value from file like this....
varchar x =343,987,0,763,22,88,099,736,0,22,0
Now i want to find the highest, lowest, and if any only zero values are there, i have to remove zeros.
I have to update table with these values(highest, lowest, and zero removed value)
For highest, i wll do with GREATEST function. For other two, any help is appriciated.
Thanks in advance...
Pal

SQL> var x varchar2(40)
SQL> exec :x := '343,987,0,763,22,88,099,736,0,22,0'
SQL> var highest number
SQL> var lowest number
SQL> var nonzero varchar2(40)
SQL> set autop on
SQL> exec execute immediate 'select greatest('||:x||'),least('||:x||'),substr(replace('','||:x||','','',0,'','',''),2,length(replace('','||:x||','','',0,'','',''))-2) from dual' into :highest,:lowest,:nonzero
NONZERO
343,987,763,22,88,099,736,22
    LOWEST
         0
   HIGHEST
       987
X
343,987,0,763,22,88,099,736,0,22,0

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