Update a table based on Min value of a column of a Another Table.Pls Help.

Dear All,
Wishes,
Actually I need update statement some thing like below scenario...
Data in table is like below:
I wrote a query to fetch data like below ( actually scenario is each control number can have single or multiple PO under it ) (i used rank by to find parent to tree like show of data)
Table: T20
Control_no        P_no Col3
19950021     726473     00
19950036      731016     00
19950072     731990     00
                 731990 01
19950353     734732     00
                 734732 01
19950406     736189     00
             736588     01
             736588     02
             736588     03
Table : T30
Control_no      P_no              col3
19950021     726473
19950036     731016
19950072     731990
             731990
19950353     734732
              734732
19950406     736189
              736588
              736588
               736588
Now requirement is I need to update Table T30's col3 (which do have values in T20 but not this table) in such a way that , It should take MIN (COL3) from T20 and then update that value to related Col3)
Better I can explain through below new data format in T30 after update:
After update it should like:
Table : T30
Control_no       P_no    col3 (this is updated column)
19950021     726473   00 -- as this is min value for Pno 726473 belongs to Control NO 199950021 in Table T20 above
19950036     731016   00 -- as this is min value for Pno 726473 belongs to Control NO 199950021 in Table T20 above
19950072     731990   00 -- see here..both Pno should updated as '00' as MIN value col3 in Table T20 related to this
             731990      00     record is '00' (out of 00,01 it should select 00 and update that value here)
19950353     734732      00 -- same again both Pno should updated as '00' as MIN value col3 in TableT20 related to this
             734732      00     record is '00' (out of 00,01 it should select 00 and update that value here)
19950406     736189      00 -- As there is single col3 value in T20, 00 should be updated here.
             736588      01 -- Here it should update col3 as '01' since for this pno(736588)
             736588      01 -- Here too it should update col3 as 01 per requirement ,minimum value of this pno in T20
             736588      01 --     same here too.. Sorry if my post formatting is not good...
Hope i am clear in my requirement..(update T30 col3 based on min value of col3 of related records)
Please suggest some update sql for this...(ideas would be great)
I am using oracle 10 g version soon will be migrated to 11g..
Regards
Prasanth
Edited by: Onenessboy on Oct 20, 2010 12:13 PM
Edited by: Onenessboy on Oct 20, 2010 12:15 PM

Onenessboy wrote:
I am really sorry, my post so nonsense in look..
I used to use for actuall code..
the out put i tryped, i used [pre] , [/pre] but still does not look good..
hmm..thanks for your suggestion hoek..
so any ideas about my requirement...I would suggest spending a bit more time trying hoek's suggestion regarding {noformat}{noformat} tags instead of repeatedly asking for more help.
Because to understand your requirement, people are going to have to read it first.

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READ TABLE it_kna1 WITH KEY
land1 = 'DE'
BINARY SEARCH.
itab_index = sy-tabix.
WHILE sy-subrc = 0.
itab_index = itab_index + 1.
WRITE: /001 it_kna1-kunnr, it_kna1-land1, it_kna1-name1.
READ TABLE it_kna1 INDEX itab_index.
IF it_kna1-land1 <> 'DE'.
    sy-subrc = 99.
ENDIF.
ENDWHILE.
SKIP 1.
READ TABLE it_kna1 WITH KEY
land1 = 'US'
BINARY SEARCH.
itab_index = sy-tabix.
WHILE sy-subrc = 0.
itab_index = itab_index + 1.
WRITE: /001 it_kna1-kunnr, it_kna1-land1, it_kna1-name1.
READ TABLE it_kna1 INDEX itab_index.
IF it_kna1-land1 <> 'US'.
    sy-subrc = 99.
ENDIF.
ENDWHILE.
Rob

Update a table based on Min value of a column of a Another Table.Pls Help.

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