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On Wed, 24 Jun 2020 02:28:45 -0400
John Kaufmann <> wrote:

A lectionary is an ordered set of readings, typically using a cycle
of three or more years, to cover the Bible. In a four-year cycle the
years are simply designated {A,B,C,D}, and for each day in a year
readings are prescribed from different parts of the Bible. For any
year, storing the readings in a database table is straightforward in
two dimensions [fields (readings) x records (days)], and it is simple
to SELECT the set of readings (usually from four different fields)
for any day.

Obviously it is possible to do this in one table per year (say, four
tables for four years), but since the pattern of records and fields
is the same for all years, that is clumsy and should be unnecessary.
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

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.


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