mysql 常用语句（补充中）

1. 删除字段

　　格式：ALTER TABLE 表名 DROP 属性名;mysql> desc test;
+----------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+---------------------+------+-----+---------+----------------+
| create_date | datetime | YES | | NULL | |
| modified_date | datetime | YES | | NULL | |
| id | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| user_id | bigint(20) unsigned | NO | | NULL | |
| sync_time | varchar(16) | YES | | NULL | |
| status | varchar(16) | NO | | NULL | |
| first_name | varchar(64) | YES | | NULL | |
| last_name | varchar(64) | YES | | NULL | |
| shop_id | bigint(20) unsigned | YES | | NULL | |
+----------------+---------------------+------+-----+---------+----------------+

mysql> alter table test drop shop_id;
Query OK, 0 rows affected (0.03 sec)
Records: 0  Duplicates: 0  Warnings: 0

2.