Comments on: MySQL Error Number 1005 Can’t create table ‘.\mydb\#sql-328_45.frm’ (errno: 150)

By: Anil

Anil — Thu, 02 Feb 2012 23:30:16 +0000

Here’s one more possibility:

If you are creating a composite foreign key, then you’ll get ‘errno: 150′ if you qualify the parent table name with its schema name.

For example, the following throws error 150:

ALTER TABLE schema.tab_1 ADD FOREIGN KEY (a, b) REFERENCES schema.tab_2(a, b)

But the following doesn’t:
ALTER TABLE schema.tab_1 ADD FOREIGN KEY (a, b) REFERENCES tab_2(a, b)

Weird reason, eh? Who’d have thunk about it! This only happens for composite keys. For single keys, having or lacking schema prefix makes no difference.

I think the problem is at the operating system level, when MySQL tries to create and move temp files around during an ALTER operation. Whatever it is, it certainly is a bug. A silly one at that.

By: Elias

Elias — Sat, 28 Jan 2012 15:18:03 +0000

When using InnoDB and working between different OS’s (Win and Linux…), watch out for the case-sensativity:
http://blog.rough-sea.com/2010/06/innodb-the-case-sensitive-monster/

When I set lower_case_table_names to 0, I started getting the 1005 error.

By: Jason

Jason — Sat, 17 Dec 2011 23:33:07 +0000

thanks, i added it to the article

By: MySQL Foriegn Key create ERROR: MySQL Error Number 1005 | Tastala WP0

MySQL Foriegn Key create ERROR: MySQL Error Number 1005 | Tastala WP0 — Sat, 17 Dec 2011 14:35:42 +0000

[...] Jason summarized very good article to track down error reported on his blog. [...]

By: krishnamurthy

krishnamurthy — Sat, 17 Dec 2011 10:07:24 +0000

your post helped me a lot.
my problem was #3. my foriegn key name was not unique.

By: Scott Noyes

Scott Noyes — Thu, 15 Dec 2011 17:08:00 +0000

“SHOW INNODB STATUS” is deprecated in 5.0 and removed in 5.5. It’s “SHOW ENGINE INNODB STATUS” now.

By: JS

JS — Fri, 02 Dec 2011 19:52:54 +0000

thanks guys for the suggestions! keep up the good work , what worked for me this: make sure the foreign key field exist in the table in wich you make a reference from to another table. not only in a manually create table statement the line : foreign key (test) references table(test). (like my teacher said ^^)
also what worked after all was to just create the table and then alter the table, add a field and add the foreign key.

By: Heiko

Heiko — Thu, 01 Dec 2011 20:33:09 +0000

“One of the fields in the relationship is part of a combination (composite) key and does not have it’s own individual index. Even though the field has an index as part of the composite key, you must create a separate index for only that key field in order to use it in a constraint. (Thanks to Alex for this tip)”

This was my problem, but even after I read it, it took me a while to figure it out.

You need to create an INDEX on the column you are referencing on the PARENT table.

By: ADD Constraint liefert #1005 - Can't create table 'x.#sql-e24_25 (Beispiel sql dabei) - PHP-Scripte PHP-Tutorials PHP-Jobs und vieles mehr

Tue, 22 Nov 2011 20:19:12 +0000

[...] UNIQUE INDEX das Problem behoben. Hier habe ich letztendlich die Info bei Known Issues gefunden: MySQL Error Number 1005 Can’t create table ‘.mydb#sql-328_45.frm’ (errno: 150) | V… __________________ SQL Injection kitteh [...]

By: Sabri Moussi

Sabri Moussi — Thu, 17 Nov 2011 20:22:49 +0000

I have been having problems in getting this to work….:

CREATE TABLE Booking (
cottageNo char(5) not null,
customerNo char(5),
dateFrom date,
dateTo date,
status varchar(10),
primary key(dateFrom),
foreign key (status) REFERENCES cottage ON DELETE SET NULL ON UPDATE CASCADE);

Any suggestions?? I am using the InnoDB.