（1）User simple registration information table.
Tb_customer
| Fields | Type | Key | |
| Customer_id | int | PK | NOT NULL |
| Customer_password | varchar | – | NOT NULL |
| Customer_email | varchar | – | NOT NULL |
（2）Group information table
Tb_group
| Fields | Type | Key | |
| Group_id | int | PK | NOT NULL |
| Group_name | varchar | – | NOT NULL |
| Group_org | int | FK | NOT NULL |
| Group_Date | Date | – | NOT NULL |
| Group_type | varchar | – | NOT NULL |
(3) Friend information table
Tb_friend
| Fields | Type | Key | |
| Friend_id | int | PK | NOT NULL |
| Friend_user | int | FK | NOT NULL |
| Friend_Item | int | FK | NOT NULL |
| Friend_name | varchar | – | NOT NULL |
(4) Race information table
Tb_item
| Fields | Type | Key | |
| Item_id | int | PK | NOT NULL |
| Item_group | int | FK | NOT NULL |
| Item_startime | Date | – | NOT NULL |
| Item_endtime | Date | – | NOT NULL |
| Item_startprice | varchar | – | NOT NULL |
| Item_endprice | varchar | – | NOT NULL |
| Item_state | int | – | NOT NULL |
| Item_number | int | – | NOT NULL |
(5) User details table
Tb_user
| Fields | Type | Key | |
| User_id | int | PK | NOT NULL |
| User_name | varchar | – | NOT NULL |
| User_email | varchar | – | NOT NULL |
| User_tel | int | – | NOT NULL |
| User_signature | varchar | – | NOT NULL |
| User_gender | varchar | – | NOT NULL |
| User_item | int | FK | NOT NULL |
| User_friend | int | FK | NOT NULL |
| User_group | int | FK | NOT NULL |
| User_customer | int | FK | NOT NULL |