Calculating Pi Using Only Pure SQL
Suppose table Numbers has numbers from 1 to 1000.
The problem: using pure SQL find the closest approximation to Pi number as a ratio of two integers. The integers should not exceed 999.
The solution is:
SELECT TOP 100 m, n, c FROM(
SELECT n1.Number m, n2.Number n, ABS(SIN(1.0*n1.Number/n2.Number)) c
FROM Numbers n1, Numbers n2
WHERE n1.Number BETWEEN 100 AND 999
AND n2.Number BETWEEN 100 AND 999) t
ORDER BY c
The answer is 355/113.