Menghapus Column Foreign Key MySQL

Isi dari table ServIntervalMap adalah sebagai berikut

CREATE TABLE IF NOT EXISTS `ServIntervalMap` (
  `ClientServIntervalMapID` int(11) NOT NULL AUTO_INCREMENT,
  `ClientID` int(11) NOT NULL,
  `ComponentModelID` int(11) NOT NULL,
  `ServiceIntervalStandard` int(11) NOT NULL,
  `ServiceIntervalMeasureID` int(11) NOT NULL,
  `OverhaulIntervalStandard` int(11) NOT NULL,
  `OverhaulIntervalMeasureID` int(11) NOT NULL,
  `MidlifeIntervalStandard` int(11) NOT NULL,
  `MidlifeIntervalMeasureID` int(11) NOT NULL,
  `CreatedBy` varchar(20) NOT NULL,
  `CreateDate` datetime NOT NULL,
  `IsActive` enum('Yes','No') NOT NULL,
  PRIMARY KEY (`ClientServIntervalMapID`),
  KEY `ClientID` (`ClientID`),
  KEY `ComponentModelID` (`ComponentModelID`),
  KEY `ServiceIntervalMeasureID` (`ServiceIntervalMeasureID`),
  KEY `OverhaulIntervalMeasureID` (`OverhaulIntervalMeasureID`),
  KEY `MidlifeIntervalMeasureID` (`MidlifeIntervalMeasureID`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

perintah untuk menghapus kolom MySQL adalah

ALTER TABLE ServIntervalMap DROP ServiceIntervalMeasureID

tapi perintah diatas menghasilkan error

ERROR 1025 (HY000): Error on rename of './fokus/#sql-dce_85' to './fokus/ServIntervalMap' (errno: 150)
MariaDB [fokus]> Ctrl-C -- exit!on_ibfk_1 FOREIGN KEY (country_id) REFERENCES country (id) ON DELETE NO ACTION ON UPDATE NO ACTION

cara untuk mengatasinya adalah, dengan mengecek foreign_keynya terlebih dahulu dengan perintah

SHOW CREATE TABLE ServiceIntervalMeasure;

disini kita dapat nama foreign key dari ServIntervalMap seperti dibawah ini

CREATE TABLE `ServIntervalMap` (
 `ClientServIntervalMapID` int(11) NOT NULL AUTO_INCREMENT,
 `ClientID` int(11) NOT NULL,
 `ComponentModelID` int(11) NOT NULL,
 `ServiceIntervalStandard` int(11) NOT NULL,
 `ServiceIntervalMeasureID` int(11) NOT NULL,
 `OverhaulIntervalStandard` int(11) NOT NULL,
 `OverhaulIntervalMeasureID` int(11) NOT NULL,
 `MidlifeIntervalStandard` int(11) NOT NULL,
 `MidlifeIntervalMeasureID` int(11) NOT NULL,
 `CreatedBy` varchar(20) NOT NULL,
 `CreateDate` datetime NOT NULL,
 `IsActive` enum('Yes','No') NOT NULL,
 PRIMARY KEY (`ClientServIntervalMapID`),
 KEY `ClientID` (`ClientID`),
 KEY `ComponentModelID` (`ComponentModelID`),
 KEY `ServiceIntervalMeasureID` (`ServiceIntervalMeasureID`),
 KEY `OverhaulIntervalMeasureID` (`OverhaulIntervalMeasureID`),
 KEY `MidlifeIntervalMeasureID` (`MidlifeIntervalMeasureID`),
 CONSTRAINT `ServIntervalMap_ibfk_5` FOREIGN KEY (`MidlifeIntervalMeasureID`) REFERENCES `measure` (`MeasureID`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `ServIntervalMap_ibfk_1` FOREIGN KEY (`ClientID`) REFERENCES `clients` (`client_id`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `ServIntervalMap_ibfk_2` FOREIGN KEY (`ComponentModelID`) REFERENCES `component_model` (`component_model_id`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `ServIntervalMap_ibfk_3` FOREIGN KEY (`ServiceIntervalMeasureID`) REFERENCES `measure` (`MeasureID`) ON DELETE CASCADE ON UPDATE CASCADE,
 CONSTRAINT `ServIntervalMap_ibfk_4` FOREIGN KEY (`OverhaulIntervalMeasureID`) REFERENCES `measure` (`MeasureID`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1

sekarang hapus foreign colum ServiceIntervalMeasureID dengan cara

ALTER TABLE  ServIntervalMap DROP foreign key ServIntervalMap_ibfk_3

terakhir hapus kolom tersebut dari table

ALTER TABLE  ServIntervalMap DROP ServiceIntervalMeasureID;

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