解決錯誤代碼：1005無法創建表 ''（錯誤：150）錯誤

Question

我創造下在mysql中

1. POSTMASTER
2. ADVERTISEMENT
3. CANDIDATEMAIN

三個表

以下是創建語句

POSTMASTER

CREATE TABLE `postmaster` (
    `POSTCODE` int(2) NOT NULL DEFAULT '0', 
    `POSTNAME` varchar(250) DEFAULT NULL, 
    PRIMARY KEY (`POSTCODE`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 

ADVERTISEMENT

CREATE TABLE `advertisment` (
    `ADVTNO` varchar(35) NOT NULL, 
    `ADVTDATE` date NOT NULL, 
    `POSTCODE` int(2) NOT NULL, 
    `ADVTOPENDATE` date NOT NULL COMMENT 'ADVERTISEMENT OPENING DATE', 
    `ADVTCLOSEDATE` date NOT NULL COMMENT 'ADVERTISEMENT CLOSING DATE', 
    `EDITCLOSEDATE` date NOT NULL COMMENT 'CLOSING DATE FOR EDITING APPLICATION', 
    `LASTREPRINTDATE` date NOT NULL COMMENT 'LAST DATE FOR REPRINTING APPLICATION', 
    `FEESCST` int(4) NOT NULL COMMENT 'FEE FOR SC/ST CATEGORY', 
    `FEESTAFF` int(4) DEFAULT NULL COMMENT 'FEE FOR STAFF ', 
    `FEEOBC` int(4) DEFAULT NULL COMMENT 'FEE FOR OBC CATEGORY', 
    `ADVOCATEEXPERIENCE` int(2) DEFAULT NULL, 
    PRIMARY KEY (`ADVTNO`,`ADVTDATE`,`POSTCODE`), 
    KEY `fk_post` (`POSTCODE`), 
    CONSTRAINT `fk_post` FOREIGN KEY (`POSTCODE`) REFERENCES `postmaster` (`POSTCODE`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 

一切都到這裏被罰款，但是當我去創造CANDIDATEMAIN表，收到錯誤

這裏是CANDIDATEMAIN

CREATE TABLE `candidatemain` (

    `ADVTNO` varchar(35) NOT NULL DEFAULT '', 
    `ADVTDATE` date NOT NULL DEFAULT '0000-00-00', 
    `POSTCODE` int(2) NOT NULL DEFAULT '0', 
    `REGISTRATIONNO` int(6) NOT NULL DEFAULT '0', 
    `SALUTATION` varchar(10) NOT NULL, 
    `FULLNAME` varchar(90) NOT NULL, 
    `SURNAME` varchar(30) DEFAULT NULL, 
    `NAME` varchar(30) NOT NULL, 
    `LASTNAME` varchar(30) DEFAULT NULL, 
    `LASTUPDATEDIP` varchar(20) NOT NULL DEFAULT '', 
    `LASTUPDATEDDATE` date DEFAULT NULL, 
    `ENTRYDATE` date NOT NULL, 
    PRIMARY KEY (`ADVTNO`,`ADVTDATE`,`POSTCODE`,`REGISTRATIONNO`), 
    KEY `FK_ADVT` (`ADVTNO`, `ADVTDATE`,`POSTCODE`) , 
    CONSTRAINT `FK_ADVT` FOREIGN KEY (`ADVTNO`, `ADVTDATE`,`POSTCODE`) REFERENCES `advertisment` (`ADVTNO`, `ADVTDATE`,`POSTCODE`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 

的錯誤，我得到的創建語句是：

Error Code: 1005. Can't create table 'dbName.candidatemain' (errno: 150) 

有什麼能爲這個錯誤的原因是什麼？

優化版本的MySQL：的MySQL版本14.14 DISTRIB 53年5月1日，對於Win64的

Answer 1

創建advertisment表默認字符集爲utf8;

LATIN1列並不等同於UTF8列。所以外鍵約束無法正確形成。因此1005 (ER_CANT_CREATE_TABLE)錯誤。

這是我的mysql日誌。

mysql> CREATE TABLE `advertisment` (
    -> `ADVTNO` varchar(35) NOT NULL, 
    -> `ADVTDATE` date NOT NULL, 
    -> `POSTCODE` int(2) NOT NULL, 
    -> `ADVTOPENDATE` date NOT NULL COMMENT 'ADVERTISEMENT OPENING DATE', 
    -> `ADVTCLOSEDATE` date NOT NULL COMMENT 'ADVERTISEMENT CLOSING DATE', 
    -> `EDITCLOSEDATE` date NOT NULL COMMENT 'CLOSING DATE FOR EDITING APPLICATION', 
    -> `LASTREPRINTDATE` date NOT NULL COMMENT 'LAST DATE FOR REPRINTING APPLICATION', 
    -> `FEESCST` int(4) NOT NULL COMMENT 'FEE FOR SC/ST CATEGORY', 
    -> `FEESTAFF` int(4) DEFAULT NULL COMMENT 'FEE FOR STAFF ', 
    -> `FEEOBC` int(4) DEFAULT NULL COMMENT 'FEE FOR OBC CATEGORY', 
    -> `ADVOCATEEXPERIENCE` int(2) DEFAULT NULL, 
    -> PRIMARY KEY (`ADVTNO`,`ADVTDATE`,`POSTCODE`), 
    -> KEY `fk_post` (`POSTCODE`), 
    -> CONSTRAINT `fk_post` FOREIGN KEY (`POSTCODE`) REFERENCES `postmaster` (`POSTCODE`) 
    ->) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- <== This little change make it work. 
Query OK, 0 rows affected (0.06 sec) 

mysql> CREATE TABLE `candidatemain` (
    -> 
    -> `ADVTNO` varchar(35) NOT NULL DEFAULT '', 
    -> `ADVTDATE` date NOT NULL DEFAULT '0000-00-00', 
    -> `POSTCODE` int(2) NOT NULL DEFAULT '0', 
    -> `REGISTRATIONNO` int(6) NOT NULL DEFAULT '0', 
    -> `SALUTATION` varchar(10) NOT NULL, 
    -> `FULLNAME` varchar(90) NOT NULL, 
    -> `SURNAME` varchar(30) DEFAULT NULL, 
    -> `NAME` varchar(30) NOT NULL, 
    -> `LASTNAME` varchar(30) DEFAULT NULL, 
    -> `LASTUPDATEDIP` varchar(20) NOT NULL DEFAULT '', 
    -> `LASTUPDATEDDATE` date DEFAULT NULL, 
    -> `ENTRYDATE` date NOT NULL, 
    -> PRIMARY KEY (`ADVTNO`,`ADVTDATE`,`POSTCODE`,`REGISTRATIONNO`), 
    -> KEY `FK_ADVT` (`ADVTNO`, `ADVTDATE`,`POSTCODE`) , 
    -> CONSTRAINT `FK_ADVT` FOREIGN KEY (`ADVTNO`, `ADVTDATE`,`POSTCODE`) REFERENCES `advertisment ` (`ADVTNO`, `ADVTDATE`,`POSTCODE`) 
    ->) ENGINE=InnoDB DEFAULT CHARSET=utf8; 
Query OK, 0 rows affected (0.12 sec) 

Answer 2

你FOREIGN KEY CONSTRAINT爲表candidatemain和advertisment有不同的字符集，這將導致錯誤，讓他們有相同的字符集。