610. Triangle Judgement.sql

-- 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:

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