sqlplus INT数据类型的无效标识符

Question

我想创建一个具有以下属性的表客户

1. CUSTID
2. CUSTNAME
3. custAge

我像这样写了我的创建表

SQL > CREATE TABLE Customer (
 2  custId INT NOT NULL,
 3  custName VARCHAR2(45) NOT NULL,
 4  custAge INT(3) NOT NULL,
 5  PRIMARY KEY(custId),
 6  CONSTRAINT chk_CustomerAge CHECK (custAge < 100)
 7  ); 

我有这个错误

 4  custAge INTEGER(3) NOT NULL,
 ERROR at line 4:
 ORA-00904: : Invalid Indentifier

我也尝试过这样做

SQL > CREATE TABLE Customer (
 2  custId INT NOT NULL,
 3  custName VARCHAR2(45) NOT NULL,
 4  custAge INTEGER(3) NOT NULL,
 5  PRIMARY KEY(custId),
 6  CONSTRAINT chk_CustomerAge CHECK (custAge < 100)
 7  ); 

但我仍然得到同样的错误，我不明白为什么。