CREATE TYPE project_type AS OBJECT
(
ID NUMBER,
DESCRIPTION VARCHAR(10),
EMPLOYESS_NO VARCHAR(10),
TYPE VARCHAR(10)
);
CREATE TABLE project OF project_type
(
CONSTRAINT unique_ex_ID
UNIQUE(ID)
);
Type是一个保留关键字,所以我认为它在Type VARCHAR上很无聊。更改为EMPLOYEE_TYPE,看看这是否适用于