我在下表中遗漏了哪些关键字？

Question

我的问题： 我在 tables 上遇到同样的错误：Tasks，TimeSheet , TimeSheetHour.

我仍然不知道我错过了哪些关键字。

这是我在 Tasks table 中遇到的错误：（与其他 tables 相同）

我可以知道在接下来的 table 中我错过了哪些关键字吗？

-- what keywords did I missed here?
CREATE TABLE Tasks(
    IdTask  NUMBER(10,0) NOT NULL,                  
    IdProject   NUMBER(10,0) NOT NULL,       
    Task_Name   VARCHAR2(100) NOT NULL,    
    Task_Description    VARCHAR2(100),
    StartDate   DATE NOT NULL,
    EndDate DATE NOT NULL,
    CreatedAt VARCHAR2(50),
    UpdatedAt VARCHAR2(50),
    Enabled CHAR(10),
    CONSTRAINT IdTask_PK PRIMARY KEY (IdTask),
    CONSTRAINT IdProject_FK FOREIGN KEY (IdProject) REFERENCE Project_T(IdProject)
);
 

-- what keywords did I missed here?
CREATE TABLE TimeSheet(
    IdTimeSheet NUMBER(10,0) NOT NULL,
    IdUser NUMBER(10,0) NOT NULL,
    IdProject NUMBER(10,0) NOT NULL,
    TimeSheet_Name VARCHAR2(100) NOT NULL,
    TimeSheet_Description VARCHAR2(200),
    CreatedAt VARCHAR2(50),
    UpdatedAt VARCHAR2(50),
    Enabled CHAR(10),
    CONSTRAINT IdTimeSheet_PK PRIMARY KEY (IdTimeSheet),
    CONSTRAINT IdProject_FK FOREIGN KEY (IdProject) REFERENCE Project_T(IdProject),
    CONSTRAINT IdUser_FK FOREIGN KEY (IdUser) REFERENCE User_T(IdUser)
);


-- what keywords did I missed here?
CREATE TABLE TimeSheetHour(
    IdTimeSheetHour NUMBER(10,0) NOT NULL,
    IdTimeSheet NUMBER(10,0) NOT NULL,
    IdUser  NUMBER(10,0) NOT NULL,
    IdTimeCategory  NUMBER(10,0) NOT NULL,
    IdTask  NUMBER(10,0) NOT NULL,
    Quantity NUMBER(5,0) NOT NULL,
    TimeSheetHour_Description VARCHAR2(200),
    CONSTRAINT IdTimeSheetHour_PK PRIMARY KEY (IdTimeSheetHour),
    CONSTRAINT IdTimeSheet_FK FOREIGN KEY (IdTimeSheet) REFERENCE (TimeSheet),
    CONSTRAINT IdUser_FK FOREIGN KEY (IdUser) REFERENCE (User_T),
    CONSTRAINT IdTimeCategory_FK FOREIGN KEY (IdTimeCategory) REFERENCE (TimeCategory),
    CONSTRAINT IdTask_FK FOREIGN KEY (IdTask) REFERENCE Tasks(IdTask)
);

Answer 1

关键字是 REFERENCES 而不是 REFERENCE。

然后你有重名约束IdProject_FK。

然后你有外键约束，你没有指定 table 被引用。

即：

CONSTRAINT IdTimeSheet_FK FOREIGN KEY (IdTimeSheet) REFERENCE (TimeSheet)

应该是：

CONSTRAINT IdTimeSheet_FK FOREIGN KEY (IdTimeSheet) REFERENCES TimeSheet(IdTimeSheet)

或者，没有大括号和明确的列名：

CONSTRAINT IdTimeSheet_FK FOREIGN KEY (IdTimeSheet) REFERENCES TimeSheet

我在下表中遗漏了哪些关键字？

Which keywords did I missed on the following tables?

sql

dml

oracle-apex