錯誤1064（42000）：在第10行附近'''使用正確的語法

Question

所以我試圖創建一個數據庫使用MYSQL，它似乎並沒有添加到終端上的mysql表，以下錯誤代碼顯示：

**ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 10 
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 9 
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(2), 
PRIMARY KEY (guest_id), 
FOREIGN KEY (res_nr) 
)' at line 10 
ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key 
mysql> SHOW TABLES; 
+---------------------------------+ 
| Tables_in_xxxxxx_coursework_1 | 
+---------------------------------+ 
| Reservations     | 
| Room       | 
+---------------------------------+ 
2 rows in set (0.00 sec)** 

但是，此代碼工作較早，因爲當我輸入「SHOW TABLES;」時它顯示前兩個表房間和預訂所以故障不能在前兩個表中。

CREATE TABLE Room (
    id INT AUTO_INCREMENT, 
    room_id INT (3), 
    room_type VARCHAR (15), 
    guest_id INT (8), 
    res_nr INT (6), 
    price DECIMAL (6,2) unsigned, 
    extras_id INT (2), 
    PRIMARY KEY (id) 
); 

CREATE TABLE Reservations (
    id INT AUTO_INCREMENT, 
    res_no INT (6), 
    guest_id INT (8), 
    hotel_branch INT (5), 
    room_genre VARCHAR (12), 
    extras_id INT (2), 
    room_id int (3), 
    PRIMARY KEY (id), 
    FOREIGN KEY (room_id) 
    REFERENCES Room (id) 
); 

CREATE TABLE Employees (
    id INT AUTO_INCREMENT, 
    employee_id INT (6), 
    ni_id INT (9), 
    first_name VARCHAR (25), 
    surname VARCHAR (25), 
    address VARCHAR (100), 
    PRIMARY KEY (id), 
    FOREIGN KEY (first_name) 
); 

CREATE TABLE Hotel (
    id INT AUTO_INCREMENT, 
    hotel_branch INT (5), 
    employee_id INT (6), 
    hotel_name CHAR (20), 
    town VARCHAR(20), 
    num_rooms INT (3), 
    PRIMARY KEY (id), 
); 

CREATE TABLE Guest (
    id INT AUTO_INCREMENT, 
    guest_id INT (8), 
    res_nr INT(6), 
    first_name CHAR (25), 
    surname CHAR (25), 
    phone_no INT(12), 
    email VARCHAR (25), 
    room_id INT(3), 
    extras_id(2), 
    PRIMARY KEY (guest_id) 
    FOREIGN KEY (res_nr) 
); 

CREATE TABLE Bill (
    id INT AUTO_INCREMENT, 
    invoice_id INT (9), 
    guest_id INT (8), 
    room_charge DECIMAL (8,2) unsigned, 
    extra_charge DECIMAL (6,2) unsigned, 
    PRIMARY KEY (invoice_id), 
    FOREIGN KEY (guest_id) 
    REFERENCES Guest (id) 
); 

Answer 1

你是錯的建設表結構

 CREATE TABLE Room (
     id INT AUTO_INCREMENT, 
     room_id INT (3), 
     room_type VARCHAR (15), 
     guest_id INT (8), 
     res_nr INT (6), 
     price DECIMAL (6,2) unsigned, 
     extras_id INT (2), 
     PRIMARY KEY (id) 
     ); 

     CREATE TABLE Guest ( 
     guest_id INT (8), 
     res_nr INT(6), 
     first_name CHAR (25), 
     surname CHAR (25), 
     phone_no INT(12), 
     email VARCHAR (25), 
     room_id INT(3), 
     extras_id int (2), 
     PRIMARY KEY (guest_id), 
     CONSTRAINT fk_res FOREIGN KEY (res_nr) REFERENCES Room (id)) 

正如你可以檢查上面我已經使用的空間成爲其機房表的主鍵ID創建FK res_nr。你試圖做的是引用一個不起作用的整數值。 嘗試更多地瞭解FK。[http://www.w3schools.com/sql/sql_foreignkey.asp]