Create build-the-equation.sql

Author: kamyu104

MySQL/build-the-equation.sql

@@ -0,0 +1,17 @@
+# Time:  O(nlogn)
+# Space: O(n)
+
+SELECT 
+    CONCAT(
+        GROUP_CONCAT(
+        CASE 
+            WHEN factor > 0 THEN CONCAT('+', factor)
+            ELSE factor
+        END,
+        CASE 
+            WHEN power=0 THEN ''
+            WHEN power=1 THEN 'X'
+            ELSE CONCAT('X^', power)
+        END
+        ORDER BY power DESC SEPARATOR ''), '=0') AS equation
+FROM Terms;