MySQL添加和删除字段

mysql> desc t_template_title;
+----------------+--------------+------+-----+---------+-------+
| Field          | Type         | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+-------+
| id             | int(11)      | NO   |     | 0       |       |
| effective_time | int(11)      | NO   |     | 0       |       |
| props          | varchar(128) | NO   |     |         |       |
| props_passive  | varchar(128) | NO   |     |         |       |
| buffs          | varchar(128) | NO   |     |         |       |
| name           | varchar(64)  | NO   |     |         |       |
| resource_type  | int(11)      | NO   |     | 0       |       |
| resource_id    | int(11)      | NO   |     | 0       |       |
| pic_width      | int(11)      | NO   |     | 0       |       |
| pic_height     | int(11)      | NO   |     | 0       |       |
| descript       | varchar(256) | NO   |     |         |       |
| agent          | smallint(6)  | NO   |     | 0       |       |
| type           | tinyint(4)   | NO   |     | 0       |       |
| order          | int(4)       | NO   |     | 0       |       |
+----------------+--------------+------+-----+---------+-------+

alter table t_template_title add props_passive VARCHAR(128) NOT NULL default ‘‘ after props;

mysql> alter table t_template_title drop props_passive;