Hello,

I have a table that contains two columns, USER and VALUE.  For each
user there are multiple values.  What I would like to do is, after
ordering the list by user and then value, subtract each value from the
next value and place this new data-element into a third column named
DIFF.

Example:

DATA AS IS:
USER             VALUE
1                        7
1                        9
1                       11
1                       13
2                        5
2                        6
2                        7

DATA AS I WOULD LIKE TO GET IT:
USER             VALUE         DIFF
1                        7                 -
1                        9                 2
1                       11                2
1                       15                4
2                        5                 -
2                        8                 3
2                       15                7

Anyone know how to do this in SQL or PL*SQL?

TIA!

myk

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