Judging by some of the comments posed on this list, I wonder whether the
following statements are true:
1. There is no point having an index on a field if that field can only have
a few values
2. A table should have at least ten entries, in order to prevent all the
table being scanned to find a match in a query. Does this mean that one
should pad out a table (ie add spurious values with an 'ignore' flag) in
order to force mySQL to use an index?

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