Difference between revisions of "Mysql setting constraints"

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FOREIGN KEY (hostname)
 
FOREIGN KEY (hostname)
 
REFERENCES sslhosts (hostname)
 
REFERENCES sslhosts (hostname)
 +
ON DELETE CASCADE ON UPDATE CASCADE
 
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  
 
</source>
 
</source>
 
http://www.mysqltutorial.org/mysql-primary-key/<br>
 
http://www.mysqltutorial.org/mysql-primary-key/<br>

Revision as of 12:36, 22 January 2019

https://www.percona.com/blog/2017/04/06/dealing-mysql-error-code-1215-cannot-add-foreign-key-constraint

  CONSTRAINT education_ibfk_1
    FOREIGN KEY (profile_id)
    REFERENCES Profile (profile_id)
    ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT education_ibfk_2
    FOREIGN KEY (institution_id)
    REFERENCES Institution (institution_id)
    ON DELETE CASCADE ON UPDATE CASCADE,
 
 
CREATE TABLE notes
(
hostname VARCHAR(30),
notes VARCHAR(100),
CONSTRAINT myconst_1
FOREIGN KEY (hostname)
REFERENCES sslhosts (hostname)
ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

http://www.mysqltutorial.org/mysql-primary-key/