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From:Lola J. Lee Beno Date:February 7 2006 1:42pm
Subject:Can't Create Foreign Key Constraints
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I'm trying to create foreign key constraints and keep getting an error 
message 1005 (I did look it up, but didn't see an obvious solution to 
fixing this for my database).

The version I'm using is 5.0.17-max.  I used Mysql WorkBench to create 
the database schema and had it generate the sql script.

I created a table as such:

CREATE TABLE `ows`.`FilmsRatings` (
   `RatingID` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
   `Rating` VARCHAR(50) NULL,
   PRIMARY KEY (`RatingID`)
)
ENGINE = InnoDB
CHARACTER SET utf8 COLLATE utf8_general_ci;

Then, I created another table as such:

CREATE TABLE `ows`.`Films` (
   `FilmID` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
   `MovieTitle` TEXT NULL,
   `PitchText` TEXT NULL,
   `AmountBudgeted` DECIMAL(11, 0) NULL,
   `RatingID` INT(11) NULL,
   `Summary` LONGTEXT NULL,
   `ImageName` VARCHAR(50) NULL,
   `DateInTheaters` DATETIME NULL,
   PRIMARY KEY (`FilmID`),
   CONSTRAINT `FK_RatingID` FOREIGN KEY `RatingID` (`(not null)`)
     REFERENCES `ows`.`FilmsRatings` (`RatingID`)
     ON DELETE CASCADE
     ON UPDATE CASCADE
)
ENGINE = InnoDB
CHARACTER SET utf8 COLLATE utf8_general_ci;

And got this following error message:

ERROR 1072 (42000): Key column '(not null)' doesn't exist in table

I tried again, this time deleting the CONSTRAINTs details.  Then I tried 
to alter the table as such:

mysql> alter table films
     -> add constraint fk_films_ratings
     -> foreign key (RatingID) references FilmsRatings (RatingID);

Which produced this error message:

ERROR 1005 (HY000): Can't create table './ows/#sql-a8_11.frm' (errno: 150)
mysql> drop table films;

This database is being run with InnoDB engine, so I should be able to 
create the foreign key constraints.  So why is this happening?

-- 
Lola - mailto:lola@stripped
http://www.lolajl.net | Blog at http://www.lolajl.net/blog/
Freedom is not free.
I'm in Bowie, MD, USA, halfway between DC and Annapolis.
Thread
Can't Create Foreign Key ConstraintsLola J. Lee Beno7 Feb
  • Re: Can't Create Foreign Key ConstraintsMichael Stassen7 Feb
    • Re: Can't Create Foreign Key ConstraintsLola J. Lee Beno7 Feb
      • Re: Can't Create Foreign Key ConstraintsGleb Paharenko7 Feb
        • Re: Can't Create Foreign Key ConstraintsLola J. Lee Beno7 Feb
          • Re: Can't Create Foreign Key ConstraintsGleb Paharenko7 Feb
  • Re: Can't Create Foreign Key ConstraintsPeter Brawley7 Feb
    • Re: Can't Create Foreign Key ConstraintsLola J. Lee Beno7 Feb