无法在mysql中创建表错误（150）

Question

我想创建3个表，分别称为curenttasks，originaltasks和previoustasks。 我制作一张桌子，然后复制到另外两张桌子。 但是一个表不能创建，而其他两个表则可以成功创建。

这三个表是：

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;

当前任务无法执行，错误是：

错误1005（HY000）：无法创建表'rem.currenttasks'（errno：150）

我只是很困惑，因为我删除了currenttasks并将其复制到以前的任务，用当前替换所有先前的任务，但是它仍然无法工作。

Answer 1

您忘记删除28-31之间的行。 PreviousTasks表尚未创建，但是这些行尝试更改表。 第64-67行也存在同样的问题。