Hello. I'm in the middle of a problem.
I have many many rows in a table. I need to add another column to it
which has to be subtract of value A from row N and value B from row
N-1. For example
. NEW COLUMN
2008-10-10 12:05 223
2008-10-10 12:10 226 3
2008-10-10 12:15 238 12
Etc... How this can be acomplished? Thanks in advance.
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