创建 Oracle 表时出错，无效标识符

Question

我正在尝试在 Oracle 11g 中创建表，但出现 ORA-00904 错误。创建表的语法是：

CREATE TABLE Worker(
nif VARCHAR2(9 CHAR) CONSTRAINT PK_Nif PRIMARY KEY,
nameworker VARCHAR2(50 CHAR) CONSTRAINT NN_NameWorker NOT NULL,
specialty VARCHAR2(50 CHAR) CONSTRAINT NN_Specialty NOT NULL,
CONSTRAINT CH_Speciality CHECK (speciality ='ENGINEERING' OR speciality= 'SUPPORT' OR speciality='DEVELOPMENT'),
yearsold INTEGER,
CONSTRAINT CH_Years CHECK (yearsold >= 1),
CONSTRAINT NN_Years NOT NULL,
nifCompany VARCHAR2(9 CHAR) CONSTRAINT NN_NifCompany NOT NULL,
CONSTRAINT FK_NifCompany FOREIGN KEY (nifCompany) REFERENCES Company(nif)
);

我得到的错误是：

ORA-00904: : invalid identifier
00904. 00000 -  "%s: invalid identifier"
*Cause:    
*Action:

我不知道错误在哪里。

Answer 1

你有几个问题；错误的直接原因是这一行：

CONSTRAINT NN_Years NOT NULL,

根据之前的命名，您可能打算将其包含在列定义中：

yearsold INTEGER CONSTRAINT NN_Years NOT NULL,
CONSTRAINT CH_Years CHECK (yearsold >= 1),

第二个问题是名称不一致，列定义中的specialty 与检查约束中的speciality；所以你需要修复列和非空约束名称：

speciality VARCHAR2(50 CHAR) CONSTRAINT NN_Specialty NOT NULL,

修复这些问题，并假设您确实有一个 Company 表，其中包含与此指定的 FK 匹配的 PK，将为您提供：

CREATE TABLE Worker(
  nif VARCHAR2(9 CHAR) CONSTRAINT PK_Nif PRIMARY KEY,
  nameworker VARCHAR2(50 CHAR) CONSTRAINT NN_NameWorker NOT NULL,
  speciality VARCHAR2(50 CHAR) CONSTRAINT NN_Specialty NOT NULL,
  CONSTRAINT CH_Speciality CHECK (speciality = 'ENGINEERING'
    OR speciality = 'SUPPORT' OR speciality = 'DEVELOPMENT'),
  yearsold INTEGER CONSTRAINT NN_Years NOT NULL,
  CONSTRAINT CH_Years CHECK (yearsold >= 1),
  nifCompany VARCHAR2(9 CHAR) CONSTRAINT NN_NifCompany NOT NULL,
  CONSTRAINT FK_NifCompany FOREIGN KEY (nifCompany) REFERENCES Company(nif)
);

Table WORKER created.

desc worker

Name       Null?    Type              
---------- -------- ----------------- 
NIF        NOT NULL VARCHAR2(9 CHAR)  
NAMEWORKER NOT NULL VARCHAR2(50 CHAR) 
SPECIALITY NOT NULL VARCHAR2(50 CHAR) 
YEARSOLD   NOT NULL NUMBER(38)        
NIFCOMPANY NOT NULL VARCHAR2(9 CHAR)  

Answer 2

我认为问题在于您在列定义期间指定了约束名称。你不能这样做。如果你想给它们命名，你应该以不同的方式指定约束。 试试看：

CREATE TABLE Worker(
nif VARCHAR2(9 CHAR) ,
nameworker VARCHAR2(50 CHAR) ,
specialty VARCHAR2(50 CHAR),
CONSTRAINT CH_Speciality CHECK (speciality ='ENGINEERING' OR speciality= 'SUPPORT' OR speciality='DEVELOPMENT'),
yearsold INTEGER,
CONSTRAINT CH_Years CHECK (yearsold >= 1),
CONSTRAINT NN_Years check(yearold is NOT NULL),
nifCompany VARCHAR2(9 CHAR) ,
CONSTRAINT FK_NifCompany FOREIGN KEY (nifCompany) REFERENCES Company(nif),
CONSTRAINT PK_Nif PRIMARY KEY(nif),
CONSTRAINT NN_NameWorker check(nameworker is NOT NULL),
CONSTRAINT NN_Specialty check(specialty is NOT NULL),
CONSTRAINT NN_NifCompany check(nifCompany is NOT NULL)
);

如果您遇到更多问题，请告诉我