SQL - CASE
SELECT x , y , z, CASE WHEN x + y > z AND y + z > x AND x + z > y THEN 'Yes' ELSE 'No' END AS 'Triangle' FROM Triangle; Input: Triangle table: +----+----+----+ | x | y | z | +----+----+----+ | 13 | 15 | 30 | | 10 | 20 | 15 | +----+----+----+ Output: +----+----+----+----------+ | x | y | z | triangle | +----+----+----+----------+ | 13 | 15 | 30 | No | | 10 | 20 | 15 | Yes | +----+----+----+----------+