update using case

update TRG
set
C2=(using Case only 
Where 
...



1).FOR C2 when TRG.K=SRC.K  then SRC.B ELSE 0 

    a).TRG.K=SRC.K (Only one row for id = 300 then SRC.B)
    b).TRG.K=SRC.K & TRG.K!=SRC.K (two rows row for id = 100 then 0 for first row when TRG.K=SRC.K then 0 else SRC.B)


Example:

TRG 

K       Id                      C2    

201     100                3
202     100               4

201     300                 5   


Expected:

TRG

SRC.B   K       Id                      C2    

30     201     100                0
30     202     100               30

42     201     300                 42  

It looks like, I was lucky to guess :), but this time I honestly don't know what you're after :(
If there is more than 2 ranks cnt > 1 and and rn = 1 will assign 0 to line 1 and b for the rest of the lines
Another assumption - you might be after
ranks cnt > 1 and and rn <> would assign 0 to all lines but the last (numbered cnt) and b on the last line has already been mentioned
There is another possible change: row_number() over (partition by order of identification by k desc) rn, i.e. reverse the order of numbering
Please provide the desired result

rn cnt c2 c2 c2

1   4   0  0  ?
2   4   b  0  ?
3   4   b  0  ?
4   4   b  b  ?
        |  |
        |  cnt > 1 and rn < cnt
        |
        cnt > 1 and rn = 1

Concerning

Etbin

Tags: Database

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    -------------------------------------------------------
    --  File created - Monday-May-13-2013   
    --------------------------------------------------------
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    Published by: 1003209 on May 13, 2013 10:12

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