610. Triangle Judgement

Description of the Problem

Table: Triangle

+-------------+------+
| Column Name | Type |
+-------------+------+
| x           | int  |
| y           | int  |
| z           | int  |
+-------------+------+
In SQL, (x, y, z) is the primary key column for this table.
Each row of this table contains the lengths of three line segments.

Report for every three line segments whether they can form a triangle.

Return the result table in any order.

The result format is in the following example.

Example 1:

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      |
+----+----+----+----------+

Solution

Tags: SQL

Code (MySQL)

-- Write your MySQL query statement below
SELECT 
    *, 
    IF(x + y > z AND y + z > x AND z + x > y, 'Yes', 'No') AS triangle
FROM Triangle;