Comments on: MySQL’s ERROR 1025 explained

By: Viranch Mehta

Viranch Mehta — Sun, 01 May 2011 02:59:11 +0000

Aah, thanks! This was a tricky thing. The explanation helped me solve it :)

By: pradeep mogi

pradeep mogi — Fri, 11 Feb 2011 09:06:08 +0000

mysql>Show create table isd;
Shows following output.
| isd | CREATE TABLE `isd` (
`isdname` varchar(20) NOT NULL,
`isdcp` varchar(20) default NULL,
`isdemail` char(20) default NULL,
`isdphone` bigint(12) default NULL,
`subteritory` char(20) default NULL,
`address` varchar(100) default NULL,
PRIMARY KEY (`isdname`),
KEY `subteritory` (`subteritory`),
CONSTRAINT `isd_ibfk_1` FOREIGN KEY (`subteritory`) REFERENCES `subteritory` (
`stname`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
Then follow next step
mysql> alter table isd drop foreign key isd_ibfk_1;
Next
mysql> alter table isd DROP COLUMN subteritory;
Finally it Foreign key constraint deleted successfully.

By: pradeep

pradeep — Fri, 11 Feb 2011 08:59:05 +0000

It’s Working!
Thank U very much karuna for explaining Trenton answer in detailed manner.

By: wolfalohalani

wolfalohalani — Thu, 29 Apr 2010 18:28:18 +0000

You can also get this error if you get the foreign_key name wrong. Use ‘show create table’ on the table you’re trying to drop the key for and see if it’s named what you think it is.

By: Uno

Uno — Wed, 21 Apr 2010 08:56:01 +0000

You simply put this commmand :

DELETE FROM [target_table]
INSERT IGNORE INTO [target_table] SELECT * FROM [source_table]

ENJOY IT !