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The Question is:
Dear wizzard,
I am merging two files Indexed Sequential files (say A and B) and, where
there are dupliacates, I want to keep A's records and discard B's records.
To do this I have been editing file A then INCluding file B to the bottom of
this.
I then use the Convert/fdl/nofast command and this converts the file into
ISF format with some expected duplicates being outputed to a file. However,
the problem is that in certain cases file B's duplicates are being kept
whilst file A's duplicates are d
isgarded.
HELP!
What can I do to stop this happening?
Thanks
Sam
The Answer is :
The technique described for merging SYSUAF files into a single
OpenVMS Cluster -- as described in the appendix of the OpenVMS
Cluster Systems manual -- might be of interest. The technique
uses CONVERT, and the documentation descibes how duplicate
records are handled. (SYSUAF is an RMS indexed file...)
On the face of it, the command:
$ MERGE/STABLE/NODUPLICATES A,B output
should do exactly what you want. If not, it may be worth considering
writing a program to preform the merge precisely as you want. This would
use a minor variation of the classical "Sequential Master File Update"
algorithm which can be found in any Computer Science text.
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