Question

Oracle: How does one count/sum RANGES of data values in a column?

Answer 1

A value x will be between values y and z if GREATEST(x, y) = LEAST(x, z). Look at this example:

select f2,
       sum(decode(greatest(f1,59), least(f1,100), 1, 0)) "Range 60-100",
       sum(decode(greatest(f1,30), least(f1, 59), 1, 0)) "Range 30-59",
       sum(decode(greatest(f1, 0), least(f1, 29), 1, 0)) "Range 00-29"
from   my_table
group  by f2;

For equal size ranges it might be easier to calculate it with DECODE(TRUNC(value/range), 0, rate_0, 1, rate_1, ...). Eg.

select ename "Name", sal "Salary",
       decode( trunc(f2/1000, 0), 0, 0.0,
                                  1, 0.1,
                                  2, 0.2,
                                  3, 0.31) "Tax rate"
from   my_table;

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