由于＃1046未选择数据库，因此无法创建外部

Question

CREATE TABLE fee
(
    payment_no int NOT NULL AUTO_INCREMENT,
    student_name varchar(255),
    student_class varchar(255),
    register_fee double,
    paid_fee double,
    balanced double, 
    monthly_fee double, 
    transport_fee double, 
    extra_fee double, 
    PRIMARY KEY (payment_no),
    FOREIGN KEY (student_name, student_class, register_date)
        REFERENCES kids(student_name,student_class,register_date)
)

MySQL说：文档

  

＃1046 - 未选择数据库