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On 2020-06-24 06:39, Dave Howorth wrote:

... It should be possible to do a table of three dimensions, of
which the third dimension is the year {A,B,C,D} in the cycle, so
that one could compare the readings for any given day across all
years. But I don't see how to extend tables into three (as in this
case) or more dimensions. Can someone point me in the right
direction?  [It seems like this kind of database design issue
should be common to a lot of domains.]

Every extra field added to a record creates another dimension in data
space. So you just need to add a column called, say, year that can take
each of the values 'A', 'B', 'C' or 'D' and then add that field to your
SELECT statement.

Oh, of course: an extra column for each extra dimension.  Thanks, Dave.

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