MySQL : on creating foreign key geting error no : 150

Question

the table ENUMSTATE refrying ENUMCOUNTRY but

This code results in this error: Error Code: 1005. Can't create table 'easylibdb1.enumstate' (errno: 150)

=> Enum Country

CREATE TABLE IF NOT EXISTS ENUMCOUNTRY(

    ID INT UNSIGNED NOT NULL AUTO_INCREMENT,
    NAME VARCHAR(50) DEFAULT '',
    SHORTNAME VARCHAR(50) DEFAULT '',
    STATUS BIT DEFAULT FALSE,
    PRIMARY KEY (ID)
)

=> Enum STATE

CREATE TABLE IF NOT EXISTS ENUMSTATE(

    ID INT UNSIGNED NOT NULL AUTO_INCREMENT,
    NAME VARCHAR(50) DEFAULT '',
    SHORTNAME VARCHAR(50) DEFAULT '',
    STATUS BIT DEFAULT FALSE,
    COUNTRYID INT,      
    PRIMARY KEY (ID)
    FOREIGN KEY (COUNTRYID) REFERENCES ENUMCOUNTRY(ID)  
)

Answer 1

Change table definition for ENUMSTATE with

CREATE TABLE IF NOT EXISTS ENUMSTATE(

    ID INT UNSIGNED NOT NULL AUTO_INCREMENT,
    NAME VARCHAR(50) DEFAULT '',
    SHORTNAME VARCHAR(50) DEFAULT '',
    STATUS BIT DEFAULT FALSE,
    COUNTRYID INT UNSIGNED,   -- < type should be UNSIGNED as PK in ENUMCOUNTRY  
    PRIMARY KEY (ID),  -- < you're missing comma here
    FOREIGN KEY (COUNTRYID) REFERENCES ENUMCOUNTRY(ID)  
);

Here is SQLFiddle demo

Using FOREIGN KEY Constraints
Corresponding columns in the foreign key and the referenced key must have similar data types. The size and sign of integer types must be the same. The length of string types need not be the same. For nonbinary (character) string columns, the character set and collation must be the same.

Answer 2

您在ENUMSTATE表中的PRIMARY KEY (ID)之后缺少逗号

Answer 3

There're 2 mistakes in the ENUMSTATE

1. You are missing comma after PRIMARY KEY (ID)

    PRIMARY KEY (ID), 

2. The Foreign key must have the same definition defined in a reference table ( Primary key in reference table ) with the same data type and the size.

    COUNTRYID INT UNSIGNED 

Answer 4

There is no comma after PRIMARY KEY (ID) in ENUMSTATE table. That is the reason you are getting syntax error.