Mysql 错误150:表格无法'；无法创建

我哪里做错了？我收到错误消息，无法创建150借记卡表。外键我知道，只是不知道具体是什么。帮忙

create table customer(
cust_id int auto_increment,
first_name varchar(25),
last_name varchar(25),
street varchar(25),
city varchar(25),
state char(2),
zip varchar(10),
CONSTRAINT customer_pk primary key(cust_id)
);

create table card_account(
acct_no char(16),
exp_date date,
card_type ENUM("Debit","Credit") not null,
CONSTRAINT card_account_pk primary key(acct_no,exp_date)
);

create table debit_card(
bank_no char(9) not null,
acct_no char(16),
exp_date date,
CONSTRAINT debit_card_pk primary key(acct_no,exp_date),
CONSTRAINT debit_card_acct_no_fk foreign key(acct_no) references card_account(acct_no) on delete cascade,
CONSTRAINT debit_card_exp_date_fk foreign key(exp_date) references card_account(exp_date) on delete cascade
);

---

您的

card\u账户

表有一个

复合主键

。不能在

外键

约束中单独使用这些列

但是您可以添加一个引用复合主键的

外键

：

create table debit_card(
bank_no char(9) not null,
acct_no char(16),
exp_date date,
CONSTRAINT debit_card_pk primary key(acct_no,exp_date),
CONSTRAINT debit_card_acct_no_fk foreign key(acct_no,exp_date) references card_account(acct_no,exp_date) on delete cascade
);