無法在mysql中創建表錯誤（150）

Question

我想創建3個表，分別稱為curenttasks，originaltasks和previoustasks。 我制作一張桌子，然后復制到另外兩張桌子。 但是一個表不能創建，而其他兩個表則可以成功創建。

這三個表是：

DROP TABLE IF EXISTS `CurrentTasks`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `CurrentTasks` (
  `taskID` mediumint(9) NOT NULL AUTO_INCREMENT,
  `taskName` varchar(255) NOT NULL,
  `isActive` boolean DEFAULT TRUE,   
  `startDate` datetime NOT NULL,
  `endDate` datetime NOT NULL,
  `completeDate` datetime DEFAULT NULL,
  `complexityID` smallint(6) NOT NULL,
  `managerID` mediumint(9) NOT NULL,
  `projectID` mediumint(9) NOT NULL,
  `requirementName` varchar(255) NOT NULL,
  `xPos` smallint(6) DEFAULT NULL,
  `yPos` smallint(6) DEFAULT NULL,
  `description` text NOT NULL,
  `stageName` enum('Definition','Design','Development','Testing','Evaluation') NOT NULL DEFAULT 'Definition',
  PRIMARY KEY (`taskID`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `CurrentTasks`
--

LOCK TABLES `PreviousTasks` WRITE;
/*!40000 ALTER TABLE `PreviousTasks` DISABLE KEYS */;
/*!40000 ALTER TABLE `PreviousTasks` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `PreviousTasks`
--

DROP TABLE IF EXISTS `PreviousTasks`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `PreviousTasks` (
  `taskID` mediumint(9) NOT NULL AUTO_INCREMENT,
  `taskName` varchar(255) NOT NULL,
  `isActive` boolean DEFAULT TRUE,   
  `startDate` datetime NOT NULL,
  `endDate` datetime NOT NULL,
  `completeDate` datetime DEFAULT NULL,
  `complexityID` smallint(6) NOT NULL,
  `managerID` mediumint(9) NOT NULL,
  `projectID` mediumint(9) NOT NULL,
  `requirementName` varchar(255) NOT NULL,
  `xPos` smallint(6) DEFAULT NULL,
  `yPos` smallint(6) DEFAULT NULL,
  `description` text NOT NULL,
  `stageName` enum('Definition','Design','Development','Testing','Evaluation') NOT NULL DEFAULT 'Definition',
  PRIMARY KEY (`taskID`),
  UNIQUE KEY `uniquePreviousTasks` (`requirementName`,`projectID`,`taskName`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `PreviousTasks`
--

LOCK TABLES `PreviousTasks` WRITE;
/*!40000 ALTER TABLE `PreviousTasks` DISABLE KEYS */;
/*!40000 ALTER TABLE `PreviousTasks` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `OriginalTasks`
--

DROP TABLE IF EXISTS `OriginalTasks`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `OriginalTasks` (
  `taskID` mediumint(9) NOT NULL AUTO_INCREMENT,
  `taskName` varchar(255) NOT NULL,
  `isActive` boolean DEFAULT TRUE,
  `startDate` datetime NOT NULL,
  `endDate` datetime NOT NULL,
  `completeDate` datetime DEFAULT NULL,
  `complexityID` smallint(6) NOT NULL,
  `managerID` mediumint(9) NOT NULL,
  `projectID` mediumint(9) NOT NULL,
  `requirementName` varchar(255) NOT NULL,
  `xPos` smallint(6) DEFAULT NULL,
  `yPos` smallint(6) DEFAULT NULL,
  `description` text NOT NULL,
  `stageName` enum('Definition','Design','Development','Testing','Evaluation') NOT NULL DEFAULT 'Definition',
  PRIMARY KEY (`taskID`),
  UNIQUE KEY `uniqueOriginalTasks` (`requirementName`,`projectID`,`taskName`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `OriginalTasks`
--

LOCK TABLES `OriginalTasks` WRITE;
/*!40000 ALTER TABLE `OriginalTasks` DISABLE KEYS */;
/*!40000 ALTER TABLE `OriginalTasks` ENABLE KEYS */;
UNLOCK TABLES;

當前任務無法執行，錯誤是：

錯誤1005（HY000）：無法創建表'rem.currenttasks'（errno：150）

我只是很困惑，因為我刪除了currenttasks並將其復制到以前的任務，用當前替換所有先前的任務，但是它仍然無法工作。

Answer 1

您忘記刪除28-31之間的行。 PreviousTasks表尚未創建，但是這些行嘗試更改表。 第64-67行也存在同樣的問題。