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Build a little, test a little.
What do YOU mean by "a record number"? Access doesn't have record numbers, so
you'll need to implement it yourself. Do you want a number assigned
sequentially in order of data entry? What if a record must be deleted: should
all later records get renumbered? Immediately, or can you do it in a batch
process periodically? If you change the order of records do you want the
record numbers to resequence? What specifically do you want these record
numbers to do for you?
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John W. Vinson [MVP]