A pupil Tim gets homework to identify whether three line segments could possibly form a triangle.

However, this assignment is very heavy because there are hundreds of records to calculate.

Could you help Tim by writing a query to judge whether these three sides can form a triangle, assuming table triangle holds the length of the three sides x, y and z.

| x  | y  | z  |
|----|----|----|
| 13 | 15 | 30 |
| 10 | 20 | 15 |

For the sample data above, your query should return the follow result:

| x  | y  | z  | triangle |
|----|----|----|----------|
| 13 | 15 | 30 | No |
| 10 | 20 | 15 | Yes |

Code

1) use IF

SELECT*,
if (x+y>z and x+z>y and y+z>x, "Yes","No") as triangle
FROM triangle

2) use case

SELECT
x,
y,
z,
CASE
WHEN x + y > z AND x + z > y AND y + z > x THEN 'Yes'
ELSE 'No'
END AS 'triangle'
FROM
triangle

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