diff --git a/创建数据库.sql b/创建数据库.sql
new file mode 100644
index 0000000..08b8cd5
--- /dev/null
+++ b/创建数据库.sql
@@ -0,0 +1,130 @@
+create table customers
+(
+    T_id    int auto_increment
+        primary key,
+    T_name  varchar(10) not null,
+    T_rsex  varchar(4)  null,
+    T_phone varchar(20) null
+)
+    charset = utf8mb3;
+
+create table menu_items
+(
+    primary key (M_id)
+)
+    charset = utf8mb3;
+
+create table discount_rules
+(
+    primary key (M_id),
+    constraint discount_rules_menu_items_M_id_fk
+        foreign key (M_id) references menu_items (M_id)
+            on update cascade on delete cascade
+)
+    charset = utf8mb3;
+
+create table tables
+(
+    Cz_id     varchar(10) not null
+        primary key,
+    Cz_number int         not null,
+    Cz_zt     varchar(6)  null
+)
+    charset = utf8mb3;
+
+create table workers
+(
+    W_id     varchar(10) not null
+        primary key,
+    W_name   varchar(10) null,
+    W_sex    varchar(4)  null,
+    W_stat   int         null,
+    W_salary float       null
+)
+    charset = utf8mb3;
+
+create table orders
+(
+    O_id  int auto_increment
+        primary key,
+    T_id  int         not null,
+    time  datetime    not null,
+    Cz_id varchar(10) not null,
+    W_id  varchar(10) not null,
+    items text        null,
+    constraint orders_customers_T_id_fk
+        foreign key (T_id) references customers (T_id),
+    constraint orders_tables_Cz_id_fk
+        foreign key (Cz_id) references tables (Cz_id),
+    constraint orders_workers_W_id_fk
+        foreign key (W_id) references workers (W_id)
+)
+    charset = utf8mb3;
+
+create table bills
+(
+    B_id         int auto_increment
+        primary key,
+    O_id         int      null,
+    S_price      float    null,
+    S_priceafter float    null,
+    time         datetime null,
+    constraint bills_orders_O_id_fk
+        foreign key (O_id) references orders (O_id)
+            on update cascade on delete cascade
+)
+    charset = utf8mb3;
+
+create index Cz_id
+    on orders (Cz_id);
+
+create index T_id
+    on orders (T_id);
+
+create index W_id
+    on orders (W_id);
+
+create definer = root@localhost trigger UpdateTableStatusToFreeAfterDelete
+    after delete
+    on orders
+    for each row
+BEGIN
+    UPDATE tables SET Cz_zt = '空闲' WHERE Cz_id = OLD.Cz_id;
+END;
+
+create definer = root@localhost view customer_orders as
+select `c`.`T_id`      AS `Customer_ID`,
+       `c`.`T_name`    AS `Customer_Name`,
+       `o`.`O_id`      AS `Order_ID`,
+       `o`.`time`      AS `Order_Time`,
+       `t`.`Cz_id`     AS `Table_ID`,
+       `t`.`Cz_number` AS `Table_Number`,
+       `w`.`W_id`      AS `Waiter_ID`,
+       `w`.`W_name`    AS `Waiter_Name`,
+       `o`.`items`     AS `Ordered_Items`
+from (((`mydata`.`orders` `o` join `mydata`.`customers` `c` on ((`o`.`T_id` = `c`.`T_id`))) join `mydata`.`tables` `t`
+       on ((`o`.`Cz_id` = `t`.`Cz_id`))) join `mydata`.`workers` `w` on ((`o`.`W_id` = `w`.`W_id`)));
+
+create definer = root@localhost view customers_t as
+select `mydata`.`customers`.`T_id`    AS `T_id`,
+       `mydata`.`customers`.`T_name`  AS `T_name`,
+       `mydata`.`customers`.`T_rsex`  AS `T_rsex`,
+       `mydata`.`customers`.`T_phone` AS `T_phone`
+from `mydata`.`customers`
+where (`mydata`.`customers`.`T_rsex` = '女');
+
+create definer = root@localhost view menu_item_sales as
+select `m`.`M_id`                                               AS `Menu_Item_ID`,
+       `m`.`M_name`                                             AS `Menu_Item_Name`,
+       count(0)                                                 AS `Sales_Count`,
+       sum((`m`.`M_price` * (1 - coalesce(`d`.`discount`, 0)))) AS `Total_Sales_Amount`
+from ((`mydata`.`menu_items` `m` left join `mydata`.`discount_rules` `d`
+       on ((`m`.`M_id` = `d`.`M_id`))) join `mydata`.`orders` `o` on ((find_in_set(`m`.`M_id`, `o`.`items`) > 0)))
+group by `m`.`M_id`, `m`.`M_name`, `d`.`discount`;
+
+create definer = root@localhost view table_status as
+select `mydata`.`tables`.`Cz_id`     AS `Table_ID`,
+       `mydata`.`tables`.`Cz_number` AS `Table_Number`,
+       `mydata`.`tables`.`Cz_zt`     AS `Status`
+from `mydata`.`tables`;
+