SELECT DEGREES(PI());
+---------------+
| DEGREES(PI()) |
+---------------+
| 180 |
+---------------+
SELECT DEGREES(PI() / 2);
+-------------------+
| DEGREES(PI() / 2) |
+-------------------+
| 90 |
+-------------------+
SELECT DEGREES(45);
+-----------------+
| DEGREES(45) |
+-----------------+
| 2578.3100780887 |
+-----------------+