运行代码时，我在 Java Derby 数据库中收到此外键错误

Question

I am getting this foreign key error in Java Derby database when I run the code

CREATE TABLE PURCHASE (
    $PURCHASEID INT NOT NULL GENERATED ALWAYS AS IDENTITY,$
    $PURCHASEDATE DATE,$
    $PURCHASEQUANTITY INT,$
    $CHICPRICE DOUBLE,$
    $CUSTNIC VARCHAR(14) NOT NULL,$
    $PRIMARY KEY (PURCHASEID)$
       $ FOREIGN KEY (CUSTNIC) REFERENCES CUSTOMER(CUSTNIC)$
);

[Exception, Error code 30,000, SQLState 42X01] Syntax error: Encountered "FOREIGN" at line 8, column 9. Line 8, column 9

Answer 1

If you put a comma after primary key it should work fine

CREATE TABLE PURCHASE (
    $PURCHASEID INT NOT NULL GENERATED ALWAYS AS IDENTITY,$
    $PURCHASEDATE DATE,$
    $PURCHASEQUANTITY INT,$
    $CHICPRICE DOUBLE,$
    $CUSTNIC VARCHAR(14) NOT NULL,$
    $PRIMARY KEY (PURCHASEID),$
       $ FOREIGN KEY (CUSTNIC) REFERENCES CUSTOMER(CUSTNIC)$
);

Answer 2

just try this

CREATE TABLE PURCHASE (
    $PURCHASEID INT NOT NULL GENERATED ALWAYS AS IDENTITY,$
    $PURCHASEDATE DATE,$
    $PURCHASEQUANTITY INT,$
    $CHICPRICE DOUBLE,$
    $CUSTNIC VARCHAR(14) NOT NULL,$
    $PRIMARY KEY (PURCHASEID)$
       $FOREIGN KEY (CUSTNIC) REFERENCES CUSTOMER(CUSTNIC)$
);

Answer 3

try creating the table and then add the foreign key constraint with

alter table PURCHASE add FOREIGN KEY (CUSTNIC) 
REFERENCES CUSTOMER (CUSTNIC)  

and there seems to be there is a ", " missing before FOREIGN