当我们将 CONCAT_WS() 函数与 WHERE 子句一起使用时，输出将基于 WHERE 子句中提供的条件。从‘Student’表的例子可以理解如下
例子
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)
