mysql> select * from student;
+-----------+-------+------+------+-------+
| sno | sname | ssex | sage | sdept |
+-----------+-------+------+------+-------+
| 200215121 | 李勇 | 男 | 20 | CS |
| 200215122 | 刘晨 | 女 | 21 | CS |
| 200215123 | 王敏 | 女 | 18 | MA |
| 200215124 | 张立 | 男 | 19 | IS |
+-----------+-------+------+------+-------+
mysql> select sno,sname,ssex,sage+1 as sage from student;
+-----------+-------+------+------+
| sno | sname | ssex | sage |
+-----------+-------+------+------+
| 200215121 | 李勇 | 男 | 21 |
| 200215122 | 刘晨 | 女 | 22 |
| 200215123 | 王敏 | 女 | 19 |
| 200215124 | 张立 | 男 | 20 |
+-----------+-------+------+------+