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duplicate rank()

607061Nov 6 2007 — edited Sep 8 2008

i output like this :

date code oil rank
Jan-07 a01 10 1
Jan-07 a03 5 2
Jan-07 a04 4 3
Jan-07 a05 23 4
Jan-07 a06 3 5
Feb-07 a01 25 1
Feb-07 a02 32 2
Feb-07 a03 42 3
Feb-07 a04 33 4
Feb-07 a05 52 5
Feb-07 a06 11 6

i want code a02 include altought in other month there is no code a02:

date code oil rank
Jan-07 a01 10 1
Jan-07 a02 0 2
Jan-07 a03 5 3
Jan-07 a04 4 4
Jan-07 a05 23 5
Jan-07 a06 3 6
Feb-07 a01 25 1
Feb-07 a02 32 2
Feb-07 a03 42 3
Feb-07 a04 33 4
Feb-07 a05 52 5
Feb-07 a06 11 6

and i would like high performance
thank you for your attention..

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Locked on Oct 6 2008

Added on Nov 6 2007

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