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 |
Solution 1:
# Write your MySQL query statement below
SELECT x, y, z,
IF((x <= z and y <= z and x + y > z) or (x <= y and z <= y and x + z > y) or (y <= x and z <= x and y + z > x), 'Yes', 'No')
AS triangle
FROM triangle
Solution 2:
# Write your MySQL query statement below
SELECT x, y, z,
IF(x + y > z and x + z > y and y + z > x, 'Yes', 'No')
AS triangle
FROM triangle
Solution 3:
# Write your MySQL query statement below
SELECT x, y, z,
IF(x + y <= z or x + z <= y or y + z <= x, 'No', 'Yes')
AS triangle
FROM triangle
Summary:
- nothing to say
LeetCode: 610. Triangle Judgement
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