在sql server中创建表时出现错误（关键字'PRIMARY'附近的语法不正确）

Question

我想在sql server中创建几个表，但是我得到了下面的错误。你能帮助我吗？

This error

CREATE TABLE AIRPORT 
(
    Airport_code NVARCHAR(10) PRIMARY KEY, 
    Name NVARCHAR(25) NOT NULL, 
    City NVARCHAR(25) NOT NULL, 
    State NVARCHAR(25) NOT NULL 
); 

CREATE TABLE FLIGHT 
(
    Flight_number NVARCHAR(15) PRIMARY KEY, 
    Airline NVARCHAR(25) NOT NULL, 
    Weekdays INTEGER DEFAULT 0 
); 

CREATE TABLE FLIGHT_LEG 
(
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Departure_airport_code NVARCHAR(10) NOT NULL, 
    Scheduled_departure_time TIME NOT NULL, 
    Arrival_airport_code NVARCHAR(10) NOT NULL, 
    Scheduled_arrival_time TIME NOT NULL, 
    CONSTRAINT PRIMARY KEY 
     Pk_Flight_Leg (Flight_number, Leg_number), 
    CONSTRAINT FOREIGN KEY 
     Fk_Flight_Leg_Flight (Flight_number) REFERENCES FLIGHT (Flight_number) 
      ON UPDATE CASCADE ON DELETE CASCADE 
); 

CREATE TABLE FARE 
(
    Flight_number NVARCHAR(15) NOT NULL, 
    Fare_code NVARCHAR(15) NOT NULL, 
    Amount DECIMAL(10,2) NOT NULL, 
    Restrictions NVARCHAR(50), 
    CONSTRAINT PRIMARY KEY 
     Pk_Fare (Flight_number, Fare_code), 
    CONSTRAINT FOREIGN KEY 
     Fk_Fare_Flight (Flight_number) REFERENCES FLIGHT (Flight_number) 
      ON UPDATE CASCADE ON DELETE CASCADE 
); 

CREATE TABLE AIRPLANE_TYPE 
(
    Airplane_type_name NVARCHAR(25) PRIMARY KEY, 
    Max_seats INTEGER NOT NULL, 
    Company NVARCHAR(25) 
); 

CREATE TABLE AIRPLANE 
(
    Airplane_id NVARCHAR(25) PRIMARY KEY, 
    Total_number_of_seats INTEGER NOT NULL, 
    Airplane_type NVARCHAR(25) NOT NULL, 
    CONSTRAINT FOREIGN KEY 
     Fk_Airplane_Airplane_Type (Airplane_type) REFERENCES    AIRPLANE_TYPE (Airplane_type_name) 
      ON UPDATE CASCADE ON DELETE CASCADE 
); 

CREATE TABLE LEG_INSTANCE 
(
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Leg_instance_date Date NOT NULL, 
    Number_of_available_seats INTEGER, 
    Airplane_id NVARCHAR(25) NOT NULL, 
    Departure_airport_code NVARCHAR(10) NOT NULL, 
    Departure_time TIME NOT NULL, 
    Arrival_airport_code NVARCHAR(10) NOT NULL, 
    Arrival_time TIME NOT NULL, 
    CONSTRAINT PRIMARY KEY 
     Pk_Leg_Instance (Flight_number, Leg_number, Leg_instance_date), 
    CONSTRAINT FOREIGN KEY 
     Fk_Leg_Instance_Flight_Leg (Flight_number, Leg_number) 
     REFERENCES FLIGHT_LEG (Flight_number, Leg_number) 
     ON UPDATE CASCADE ON DELETE CASCADE, 
    CONSTRAINT FOREIGN KEY 
     Fk_Leg_Instance_Airplane (Airplane_id) 
     REFERENCES AIRPLANE (Airplane_id) 
     ON UPDATE CASCADE ON DELETE CASCADE 
); 

CREATE TABLE CAN_LAND 
(
    Airplane_type_name NVARCHAR(25) NOT NULL, 
    Airport_code NVARCHAR(10) NOT NULL, 
    CONSTRAINT PRIMARY KEY 
     Pk_Can_Land (Airplane_type_name, Airport_code), 
    CONSTRAINT FOREIGN KEY 
     Fk_Can_Land_Airplane_Type (Airplane_type_name) 
     REFERENCES AIRPLANE_TYPE (Airplane_type_name) 
     ON UPDATE CASCADE ON DELETE CASCADE, 
    CONSTRAINT FOREIGN KEY 
     Fk_Can_Land_Airport (Airport_code) 
     REFERENCES AIRPORT (Airport_code) 
     ON UPDATE CASCADE ON DELETE CASCADE 
); 

CREATE TABLE SEAT_RESERVATION 
(
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Leg_instance_date Date NOT NULL, 
    Seat_number INTEGER NOT NULL, 
    Customer_name NVARCHAR(50) NOT NULL, 
    Customer_phone NVARCHAR(20), 
    CONSTRAINT PRIMARY KEY 
     Pk_Seat_Reservation (Flight_number, Leg_number, Leg_instance_date, Seat_number), 
    CONSTRAINT FOREIGN KEY 
     Fk_Seat_Reservation_Leg_Instance (Flight_number, Leg_number, Leg_instance_date) 
     REFERENCES LEG_INSTANCE (Flight_number, Leg_number, Leg_instance_date)   
); 

我得到这些错误：

消息156，级别15，状态1，行关键字近23
不正确的语法 '主要'。

Msg 156，Level 15，State 1，Line 37
关键字'PRIMARY'附近的语法不正确。

Msg 156，Level 15，State 1，Line 56
关键字'FOREIGN'附近的语法不正确。

Msg 156，Level 15，State 1，Line 73
关键字'PRIMARY'附近的语法不正确。

Msg 156，Level 15，State 1，Line 90
关键字'PRIMARY'附近的语法不正确。

Msg 156，Level 15，State 1，Line 111
关键字'PRIMARY'附近的语法不正确。

Answer 1

您必须命名CONSTRAINT首先你写CONSTRAINT关键字刚过：

CREATE TABLE AIRPORT (
    Airport_code NVARCHAR(10) PRIMARY KEY, 
    Name NVARCHAR(25) NOT NULL, 
    City NVARCHAR(25) NOT NULL, 
    State NVARCHAR(25) NOT NULL 
); 



CREATE TABLE FLIGHT (
    Flight_number NVARCHAR(15) PRIMARY KEY, 
    Airline NVARCHAR(25) NOT NULL, 
    Weekdays INTEGER DEFAULT 0 
); 



CREATE TABLE FLIGHT_LEG (
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Departure_airport_code NVARCHAR(10) NOT NULL, 
    Scheduled_departure_time TIME NOT NULL, 
    Arrival_airport_code NVARCHAR(10) NOT NULL, 
    Scheduled_arrival_time TIME NOT NULL, 
    CONSTRAINT Pk_Flight_Leg PRIMARY KEY (Flight_number, Leg_number), 
    CONSTRAINT Fk_Flight_Leg_Flight FOREIGN KEY (Flight_number) 
    REFERENCES 
     FLIGHT (Flight_number) 
    ON UPDATE CASCADE ON DELETE CASCADE 
); 



CREATE TABLE FARE (
    Flight_number NVARCHAR(15) NOT NULL, 
    Fare_code NVARCHAR(15) NOT NULL, 
    Amount DECIMAL(10,2) NOT NULL, 
    Restrictions NVARCHAR(50), 
    CONSTRAINT Pk_Fare PRIMARY KEY 
     (Flight_number, Fare_code), 
    CONSTRAINT Fk_Fare_Flight FOREIGN KEY 
     (Flight_number) 
    REFERENCES 
     FLIGHT (Flight_number) 
    ON UPDATE CASCADE ON DELETE CASCADE 
); 



CREATE TABLE AIRPLANE_TYPE (
    Airplane_type_name NVARCHAR(25) PRIMARY KEY, 
    Max_seats INTEGER NOT NULL, 
    Company NVARCHAR(25) 
); 



CREATE TABLE AIRPLANE (
    Airplane_id NVARCHAR(25) PRIMARY KEY, 
    Total_number_of_seats INTEGER NOT NULL, 
    Airplane_type NVARCHAR(25) NOT NULL, 
    CONSTRAINT Fk_Airplane_Airplane_Type FOREIGN KEY 
     (Airplane_type) 
    REFERENCES 
     AIRPLANE_TYPE (Airplane_type_name) 
    ON UPDATE CASCADE ON DELETE CASCADE 
); 



CREATE TABLE LEG_INSTANCE (
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Leg_instance_date Date NOT NULL, 
    Number_of_available_seats INTEGER, 
    Airplane_id NVARCHAR(25) NOT NULL, 
    Departure_airport_code NVARCHAR(10) NOT NULL, 
    Departure_time TIME NOT NULL, 
    Arrival_airport_code NVARCHAR(10) NOT NULL, 
    Arrival_time TIME NOT NULL, 
    CONSTRAINT Pk_Leg_Instance PRIMARY KEY 
     (Flight_number, Leg_number, Leg_instance_date), 
    CONSTRAINT Fk_Leg_Instance_Flight_Leg FOREIGN KEY 
     (Flight_number, Leg_number) 
    REFERENCES 
     FLIGHT_LEG (Flight_number, Leg_number) 
    ON UPDATE CASCADE ON DELETE CASCADE, 
    CONSTRAINT Fk_Leg_Instance_Airplane FOREIGN KEY 
     (Airplane_id) 
    REFERENCES 
     AIRPLANE (Airplane_id) 
    ON UPDATE CASCADE ON DELETE CASCADE 
); 



CREATE TABLE CAN_LAND (
    Airplane_type_name NVARCHAR(25) NOT NULL, 
    Airport_code NVARCHAR(10) NOT NULL, 
    CONSTRAINT Pk_Can_Land PRIMARY KEY 
     (Airplane_type_name, Airport_code), 
    CONSTRAINT Fk_Can_Land_Airplane_Type FOREIGN KEY 
     (Airplane_type_name) 
    REFERENCES 
     AIRPLANE_TYPE (Airplane_type_name) 
    ON UPDATE CASCADE ON DELETE CASCADE, 
    CONSTRAINT Fk_Can_Land_Airport FOREIGN KEY 
     (Airport_code) 
    REFERENCES 
     AIRPORT (Airport_code) 
    ON UPDATE CASCADE ON DELETE CASCADE 
); 



CREATE TABLE SEAT_RESERVATION (
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Leg_instance_date Date NOT NULL, 
    Seat_number INTEGER NOT NULL, 
    Customer_name NVARCHAR(50) NOT NULL, 
    Customer_phone NVARCHAR(20), 
    CONSTRAINT Pk_Seat_Reservation PRIMARY KEY 
     (Flight_number, Leg_number, Leg_instance_date, Seat_number), 
    CONSTRAINT Fk_Seat_Reservation_Leg_Instance FOREIGN KEY 
     (Flight_number, Leg_number, Leg_instance_date) 
    REFERENCES 
     LEG_INSTANCE (Flight_number, Leg_number, Leg_instance_date) 

); 

Answer 2

你必须在代码中的两个问题。

1. 当您想命名约束时，使用CONSTRAINT关键字。
2. 列出主键和外键列时不要重复表名。

例如，对于FLIGHT_LEG，定义应该是这样的：

CREATE TABLE FLIGHT_LEG (
    Flight_number NVARCHAR(15) NOT NULL, 
    Leg_number INTEGER NOT NULL, 
    Departure_airport_code NVARCHAR(10) NOT NULL, 
    Scheduled_departure_time TIME NOT NULL, 
    Arrival_airport_code NVARCHAR(10) NOT NULL, 
    Scheduled_arrival_time TIME NOT NULL, 
    PRIMARY KEY (Flight_number, Leg_number), 
    FOREIGN KEY (Flight_number) REFERENCES FLIGHT (Flight_number) 
      ON UPDATE CASCADE ON DELETE CASCADE 
); 

我会鼓励你想想合成键表格 - 数字标识列，而不是字符串。数字键在索引和外键关系中效率更高。