Comment la fonction CONCAT_WS() fonctionne-t-elle avec la clause MySQL WHERE ?

mysql> Select CONCAT_WS(' ',Name, Last_name, 'Resident of', Address, 'is studying', Subject)AS 'Student Detail' from student WHERE id = 20;
+----------------------------------------------------------------+
| Student Detail                                                 |
+----------------------------------------------------------------+
| Gaurav Rathore Resident of Jaipur is studying Computers        |
+----------------------------------------------------------------+
1 row in set (0.00 sec)