MySQL SUM() 函数如何评估它是否获得具有字符数据类型的列作为其参数？

mysql> Select * from Social;

+------+-------+
| Id   | Name  |
+------+-------+
| 100  | Rahul |
+------+-------+

1 row in set (0.00 sec)

mysql> Select SUM(Name) From Social;

+-----------+
| SUM(Name) |
+-----------+
| 0         |
+-----------+

1 row in set, 1 warning (0.00 sec)