在Oracle Database 11g SQL中创建表时出错

Question

我是SQL的新手，正在尝试创建新表，但是在SQL命令行中运行脚本时遇到错误，我得到的错误是ORA-00942缺少右括号或ORA-00942表或视图不存在。

哦，是的，我知道我可能已经写了一些糟糕的脚本，但是如前所述，我正在学习，所以任何有意义的批评以及一些帮助都将不胜感激:)。

CREATE TABLE Branch
(
Branch_ID varchar(5),
Branch_Name varchar(255),
Branch_Address varchar(255),
Branch_Town varchar(255),
Branch_Postcode varchar(10),
Branch_Phone varchar(50),
Branch_Fax varchar(50),
Branch_Email varchar(50),
Property_ID varchar(5),
Contract_ID varchar(5),
Staff_ID varchar(5),
PRIMARY KEY (Branch_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_Id),
FOREIGN KEY (Contract_ID) REFERENCES Contract(Contract_Id),
FOREIGN KEY (Staff_ID) REFERENCES Staff(Staff_Id)
); 

CREATE TABLE Staff 
(
Staff_ID varchar(5),
Staff_Forename varchar(255),
Staff_Surname varchar(255),
Staff_Address varchar(255),
Staff_Town varchar(255)
Staff_Postcode varchar(10),
Staff_Phone varchar(50),
Staff_DOB varchar(50),
Staff_NIN varchar(10),
Staff_Salary varchar(50),
Staff_Date_Joined varchar(100),
Staff_Viewing_Arranged varchar(100),
Branch_ID varchar(5),
Sales_ID varchar(5),
PRIMARY KEY (Staff_ID),
FOREIGN KEY (Branch_ID) REFERENCES Branch(Branch_ID),
FOREIGN KEY (Sales_ID) REFERENCES Sales(Sales_Id)
);

CREATE TABLE Sales 
(
Sales_ID varchar(5),
Property_Address varchar(255),
Property_Town varchar(255)
Property_Postcode varchar(10),
Property_Type varchar(255),
Num_Rooms varchar(50),
Date_of_Sale varchar(10),
Sales_Bonus varchar(100),
Branch_ID varchar(5),
Property_ID varchar(5),
Staff_ID varchar(5)
Seller_ID varchar(5),
PRIMARY KEY (Sales_ID),
FOREIGN KEY (Branch_ID) REFERENCES Branch(Branch_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_Id),
FOREIGN KEY (Staff_ID) REFERENCES Staff(Staff_Id),
FOREIGN KEY (Seller_ID) REFERENCES Seller(Seller_Id)
);

CREATE TABLE Contract 
(
Contract_ID varchar(5),
Contract_Signed_Date varchar(50),
Property_ID varchar(5),
Buyer_ID varchar(5),
Seller_ID varchar(5),
Branch_ID varchar(5),
PRIMARY KEY (Contract_ID),
FOREIGN KEY (Branch_ID) REFERENCES Branch(Branch_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_Id),
FOREIGN KEY (Seller_ID) REFERENCES Seller(Seller_Id),
FOREIGN KEY (Buyer_ID) REFERENCES Buyer(Buyer_Id)
);

CREATE TABLE Buyer 
(
Buyer_ID varchar(5),
Viewing_Data varchar(255),
Maximum_Budject varchar(255),
Purchase_Price varchar (50),
Buyer_Forename varchar(255),
Buyer_Surname varchar(255),
Buyer_Address varchar(255),
Buyer_Town varchar(255),
Buyer_Postcode varchar(10),
Property_ID varchar(5),
Contract_ID varchar(5),
Survey_ID varchar(5),
PRIMARY KEY (Buyer_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_ID),
FOREIGN KEY (Contract_ID) REFERENCES Contract(Contract_Id),
FOREIGN KEY (Survey_ID) REFERENCES Survey(Survey_Id)
);

CREATE TABLE Seller 
(
Seller_ID varchar(5),
Seller_Forename varchar(255),
Seller_Surname varchar(255),
Seller_Address varchar(255),
Seller_Town varchar(255),
Seller_Postcode varchar(10),
Seller_Property_ID varchar(5),
No_of_Bed varchar(5),
Contract_ID varchar(5),
Property_ID varchar(5),
Sales_ID varchar(5),
PRIMARY KEY (Seller_ID),
FOREIGN KEY (Contract_ID) REFERENCES Contract(Contract_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_Id),
FOREIGN KEY (Sales_ID) REFERENCES Sales(Sales_Id)
);

CREATE TABLE Property 
(
Property_ID varchar(5),
Property_Address varchar(255),
Property_Town varchar(255),
Property_Postcode varchar(10),
Asking_Price varchar(20),
Date_Registered varchar(50),
Property_Fixtures varchar(255),
Size_of_Rooms varchar(100),
Buyer_ID varchar(5),
Staff_ID varchar(5),
Contract_ID varchar(5),
Seller_ID varchar(5),
PRIMARY KEY (Property_ID),
FOREIGN KEY (Buyer_ID) REFERENCES Buyer(Buyer_ID),
FOREIGN KEY (Seller_ID) REFERENCES Seller(Seller_ID),
FOREIGN KEY (Staff_ID) REFERENCES Staff(Staff_Id),
FOREIGN KEY (Contract_ID) REFERENCES Contract(Contract_Id)
);

CREATE TABLE Survey 
(
Survey_ID varchar(5),
No_of_Survey varchar(10),
Survey_Type varchar(255),
Organised_By varchar(255),
Property_ID varchar(5),
Staff_ID varchar(5),
Buyer_ID varchar(5),
PRIMARY KEY (Survey_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_ID),
FOREIGN KEY (Staff_ID) REFERENCES Staff(Staff_Id),
FOREIGN KEY (Buyer_ID) REFERENCES Buyer(Buyer_Id)
);

CREATE TABLE Advert
(
Survey_ID Advert_ID varchar(5),
No_of_Adverts varchar(10),
Advert_Website varchar(255),
Advert_Newspaper varchar(255),
Property_ID varchar(5),
PRIMARY KEY (Advert_ID),
FOREIGN KEY (Property_ID) REFERENCES Property(Property_ID)
);

Answer 1

STAFF表错过,在结束

Staff_Town varchar(255)

Sales表

Property_Town varchar(255) 
Staff_ID varchar(5)

另外，您不能为尚未创建的表定义约束。 我可以找到删除这些约束的错误。

Answer 2

在创建要引用的表之前，无法定义外键引用。 因此，如果外键引用是循环的，则A => B => C => A，则必须首先创建表，然后使用ALTER TABLE定义外键。 否则，请按顺序创建表，首先在其中创建表，然后创建引用该表的表。

Answer 3

您的脚本引用了尚未创建的表。 即，查看您的第一个create table 。 到那时， STAFF和其他表还不存在，但是您将它们设置为外键引用。

你应该先创建表，然后将约束后的依赖到位，使用alter ：

ALTER TABLE BRANCH
ADD CONSTRAINT fk_staff_id
  FOREIGN KEY (Staff_ID) REFERENCES Staff(Staff_Id);

Answer 4

因为您有相互引用的表，所以需要在创建表后创建引用

--create table Buyer
CREATE TABLE Buyer 
(
Buyer_ID varchar(5),
Property_ID varchar(5),
PRIMARY KEY (Buyer_ID)
);

--create table Property
CREATE TABLE Property 
(
Property_ID varchar(5),
Buyer_ID varchar(5),
PRIMARY KEY (Property_ID)
);

--now you can set your reference constraints
ALTER TABLE Property Add FOREIGN KEY (Buyer_ID) REFERENCES Buyer(Buyer_ID);
ALTER TABLE Buyer Add FOREIGN KEY (Property_ID) REFERENCES Property(Property_ID);

Answer 5

您的键上语法不清楚。

这是一个带有主键和外键（fk）的创建表的示例：

 CREATE TABLE animals (
             animal_id             NUMBER(10) PRIMARY KEY,
             animal_name           VARCHAR2(50) NOT NULL,
             animal_species_code   NUMBER(50) NOT NULL
    CONSTRAINT fk_animal_species REFERENCES animal_species
                         (species_code));

Answer 6

看起来这组表中的建模可能会受益于一些添加和更改。

例如，STAFF表引用BRANCH表-但是BRANCH也引用STAFF。 这意味着BRANCH只能引用一个STAFF，反之亦然，我怀疑这不是想要的。 看来您希望BRANCH和STAFF之间存在多对多关系，而启用此功能的标准解决方案是联结表-一个包含两个表的主键的表。 BRANCH和STAFF之间的此类联结表可能如下所示：

CREATE TABLE BRANCH_STAFF
  (BRANCH_ID  VARCHAR(5)
     CONSTRAINT BRANCH_STAFF_FK1
       REFERENCES BRANCH(BRANCH_ID),
   STAFF_ID   VARCHAR(5)
     CONSTRAINT BRANCH_STAFF_FK2
       REFERENCES STAFF(STAFF_ID),
   CONSTRAINT PK_BRANCH_STAFF
     PRIMARY KEY (BRANCH_ID, STAFF_ID)
     USING INDEX);

祝你好运。