Question

说我缺少左括号，但我不知道为什么

CREATE TABLE PROJECT_STAFF
(
    Prog_id NUMBER(5),
    Project_id NUMBER(6),
    Week_Year CHAR(5),
    Hours_worked NUMBER(4,1) NOT NULL,

    CONSTRAINT PROJECT_STAFF_Prog_id_pk PRIMARY KEY,
    CONSTRAINT PROJECT_STAFF_Prog_id_fk REFERENCES PROG(Prog_id),
    CONSTRAINT PROJECT_STAFF_Project_id_pk PRIMARY KEY,
    CONSTRAINT PROJECT_STAFF_Project_id_fk REFERENCES PROJECT(Project_id),
    CONSTRAINT PROJECT_STAFF_Week_Year_pk PRIMARY KEY,
    CONSTRAINT PROJECT_STAFF_Hours_worked_ck CHECK (Hours_work > 0)
);

Answer 1

外键引用需要引用键。所以，而不是：

CONSTRAINT PROJECT_STAFF_Prog_id_fk REFERENCES PROG(Prog_id),

你需要：

CONSTRAINT PROJECT_STAFF_Prog_id_fk FOREIGN KEY (Prog_id) REFERENCES PROG(Prog_id),

与其他外键同样如此。

注意：内联引用只能使用REFERENCES语法。但是约束需要完整的语法。

SQL缺少左括号

1 个答案: