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Mysql error 1215 hy000

To be honest, the error message doesn' t help much. You just get the following line: ERROR 1215 ( HY000) : Cannot add foreign key constraint. But MySQL never tells you exactly WHY it failed. There' s actually a multitude of. Looks like you have a typo in your " references" clause. You' re missing an o in emplyee_ tbl. Try this: create table employee_ pay_ tbl ( emp_ id varchar( 9) not null primary key, position varchar( 15) not null, date_ hite date, pay_ rate decimal( 4, 2),. The syntax of FOREIGN KEY for CREATE TABLE is structured as follows: FOREIGN KEY ( index_ col_ name) REFERENCES table_ name ( index_ col_ name,. ) So your MySQL DDL should be: create table course ( course_ id. とか、 Mysql2: : Error: Cannot add or update a child row: a foreign key constraint fails ( ` foo`. みたいな外部キー制約絡みのエラーが発生したときに以下の手順で詳細. MySQLエラー1215: 外部キー制約を追加できません. 外部キー制約エラーが 発生する理由:. すべてのテーブルでInnoDBをエンジンとして使用していません。 ターゲット表の存在しないキーを参照しようとしています。 それが他のテーブルのキーで ある. 私の知る限りは、 MariaDBやMySQLの次のストレージエンジンは外部キーをサポートし ている。.

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    Error mysql

    create table t2( a int, b int, constraint b foreign key ( b) references t1( b), constraint a foreign key a ( a) references t1( a) ) engine= innodbERROR 1005 ( HY000) : Can' t create table ` test`. t2` ( errno: 150 " Foreign key constraint is incorrectly formed" ) | | Warning | 1215 | Cannot add foreign key constraint. Two problems: Create tables in this order: child tables, parent table ( with foreign keys). Replace CREATE TABLE statements: wp_ supsystic_ ss_ projects; wp_ supsystic_ ss_ networks; wp_ supsystic_ ss_ project_ networks. mysql> ALTER TABLE users ADD FOREIGN KEY( kind_ id) REFERENCES kinds( id) ON UPDATE CASCADE ON DELETE SET NULL;. I have read Database system concepts, 6th edition, Silberschatz. I' m going to implement the university database system shown in chapter 2 on OS X on MySQL. But I have a trouble with creating the table course. the table department looks like.