錯誤1005拋出MySQL

Question

我想運行5創建表語句。其中3人正在與我聲明的外鍵工作正常，但表'generalweather'和'userreg'正在拋出錯誤1005，我知道這與我的外鍵不匹配有關。我一直在尋找錯誤，但我無法找到任何地方。這兩個創建表語句有什麼問題？ （我的默認模式名爲「測試儀」）

CREATE TABLE `coastal` (
    `Date` varchar(50) NOT NULL, 
    `Time` varchar(50) NOT NULL DEFAULT '', 
    `AM/PM` varchar(45) NOT NULL, 
    `Location` varchar(50) NOT NULL DEFAULT '', 
    `Tide Description` varchar(50) DEFAULT NULL, 
    `Estimated Swell(ft)` int(11) DEFAULT NULL, 
    `Wind Speed(mph)` int(11) DEFAULT NULL, 
    `Wind Direction` varchar(45) DEFAULT NULL, 
    `Visibility (%)` varchar(50) DEFAULT NULL, 
    PRIMARY KEY (`Date`,`Time`,`Location`,`AM/PM`), 

    CONSTRAINT `coastalFK` 
    FOREIGN KEY (Date, Time, Location, `AM/PM`) 
    REFERENCES tester.locations (Date, Time, Location, `AM/PM`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION, 

    INDEX `DateFK_idx` (`Date` ASC) , 
    INDEX `TimeFK_idx` (`Time` ASC) , 
    INDEX `AM/PMFK_idx` (`AM/PM` ASC) , 
    INDEX `LocationFK_idx` (`Location` ASC) 
); 


CREATE TABLE `generalweather` (
`Date` varchar(50) NOT NULL, 
`Location` varchar(50) NOT NULL, 
`ClimateDescription` varchar(50) NOT NULL DEFAULT '', 
`Average Temperature(F)` int(11) DEFAULT NULL, 
`Elevation(ft)` varchar(50) DEFAULT NULL, 
`Recommended Activity` varchar(50) DEFAULT NULL, 
PRIMARY KEY (`Date`,`Location`,`ClimateDescription`), 

CONSTRAINT `generalweatherFK` 
FOREIGN KEY (Date, Location) 
REFERENCES tester.locations (Date, Location) 
ON DELETE NO ACTION 
ON UPDATE NO ACTION, 

INDEX `DateFK_idx` (`Date` ASC) , 
INDEX `LocationFK_idx` (`Location` ASC) 
); 


CREATE TABLE `locations` (
`Date` varchar(50) NOT NULL DEFAULT '', 
`Time` varchar(50) NOT NULL DEFAULT '', 
`AM/PM` varchar(45) NOT NULL, 
`Location` varchar(50) NOT NULL DEFAULT '', 
`Location Type` varchar(50) DEFAULT NULL, 
`Temperature (F)` varchar(45) DEFAULT NULL, 
PRIMARY KEY (`Date`,`Time`,`Location`,`AM/PM`) 
); 


CREATE TABLE `precipitation` (
`Date` varchar(50) NOT NULL, 
`Time` varchar(50) NOT NULL DEFAULT '', 
`AM/PM` varchar(45) NOT NULL, 
`Location` varchar(50) NOT NULL DEFAULT '', 
`Precipitation Chance (%)` text, 
`Wind Speed(mph)` int(11) DEFAULT NULL, 
`Wind Direction` varchar(50) DEFAULT NULL, 
`Visibility (%)` varchar(50) DEFAULT NULL, 
`Humidity (%)` varchar(50) DEFAULT NULL, 
PRIMARY KEY (`Date`,`Time`,`AM/PM`,`Location`), 
CONSTRAINT `DateFK` 
FOREIGN KEY (Date, Time, Location, `AM/PM`) 
REFERENCES tester.locations (Date, Time, Location, `AM/PM`) 
ON DELETE NO ACTION 
ON UPDATE NO ACTION, 

INDEX `DateFK_idx` (`Date` ASC) , 
INDEX `TimeFK_idx` (`Time` ASC) , 
INDEX `AM/PMFK_idx` (`AM/PM` ASC) , 
INDEX `LocationFK_idx` (`Location` ASC) 
); 


CREATE TABLE `userreg` (
`User Name` varchar(50) NOT NULL DEFAULT '', 
`Real Name` varchar(50) DEFAULT NULL, 
`Email address` varchar(50) DEFAULT 'NONE ON FILE', 
`Location` varchar(50) NOT NULL, 
PRIMARY KEY (`User Name`), 

CONSTRAINT `userregFK` 
FOREIGN KEY (`Location`) 
REFERENCES tester.locations (`Location`) 
ON DELETE NO ACTION 
ON UPDATE NO ACTION, 

INDEX `LocationFK_idx` (`Location` ASC) 
); 

Answer 1

有幾個問題。您必須在引用它的任何其他表之前構建Locations表。所以把它移到頂端。

然後，您需要爲您定義的每個FOREIGN KEY都提供一個匹配索引。你有一個複合的

PRIMARY KEY (`Date`,`Time`,`Location`,`AM/PM`) 

PRIMARY KEY了，所以你的一些FOREIGN KEY定義將正常工作。但是，您需要爲那些不使用完整複合PK的FK定義創建附加索引。這是由於父級和引用表都必須在用作FOREIGN KEY的整個列集中定義索引。

# Move this table definition to be first 
CREATE TABLE `locations` (
    `Date` varchar(50) NOT NULL DEFAULT '', 
    `Time` varchar(50) NOT NULL DEFAULT '', 
    `AM/PM` varchar(45) NOT NULL, 
    `Location` varchar(50) NOT NULL DEFAULT '', 
    `Location Type` varchar(50) DEFAULT NULL, 
    `Temperature (F)` varchar(45) DEFAULT NULL, 
    PRIMARY KEY (`Date`,`Time`,`Location`,`AM/PM`), 

    # Added these two keys for the later FK definitions 
    # Referenced by generalweatherFK: 
    INDEX (`Date`, `Location`), 
    # Referenced by userregFK 
    INDEX (`Location`) 
); 

這裏的整個事情大樓正確：http://sqlfiddle.com/#!2/d208e