我正在尝试在MySQL中创建一个视图，其中显示了玩家的名字，他们的监护人姓名，他们的监护人电话号码以及玩家所在的团队。
我有这个创建数据库的脚本：
DROP TABLE IF EXISTS TeamCoach;
DROP TABLE IF EXISTS TeamPlayer;
DROP TABLE IF EXISTS CoachQualification;
DROP TABLE IF EXISTS PlayerGuardian;
DROP TABLE IF EXISTS PersonAddress;
DROP TABLE IF EXISTS PersonPhoneNumber;
DROP TABLE IF EXISTS Coach;
DROP TABLE IF EXISTS Player;
DROP TABLE IF EXISTS Qualification;
DROP TABLE IF EXISTS Team;
DROP TABLE IF EXISTS PhoneNumber;
DROP TABLE IF EXISTS School;
DROP TABLE IF EXISTS Person;
DROP TABLE IF EXISTS Address;
DROP TABLE IF EXISTS Guardian;
DROP FUNCTION IF EXISTS TeamSize;
CREATE TABLE Qualification (
qualificationID int NOT NULL AUTO_INCREMENT,
name varchar(30) NOT NULL,
level int NOT NULL,
PRIMARY KEY (qualificationID)
) ENGINE=InnoDB;
CREATE TABLE Team (
teamID int NOT NULL AUTO_INCREMENT,
name varchar(30) NOT NULL,
ageGroup varchar(30) NOT NULL,
year int NOT NULL,
PRIMARY KEY (teamID)
) ENGINE=InnoDB;
CREATE TABLE Address (
addressID int NOT NULL AUTO_INCREMENT,
number int NOT NULL,
street varchar(30) NOT NULL,
suburb varchar(30) NOT NULL,
townCity varchar(30) NOT NULL,
PRIMARY KEY (addressID)
) ENGINE=InnoDB;
CREATE TABLE PhoneNumber (
phoneNumberID int NOT NULL AUTO_INCREMENT,
number varchar(20) NOT NULL,
PRIMARY KEY (phoneNumberID)
) ENGINE=InnoDB;
CREATE TABLE School (
schoolID int NOT NULL AUTO_INCREMENT,
name varchar(30) NOT NULL,
PRIMARY KEY (schoolID)
) ENGINE=InnoDB;
CREATE TABLE Person (
personID int NOT NULL AUTO_INCREMENT,
name varchar(30) NOT NULL,
email varchar(30) NOT NULL,
photo varchar(30) NOT NULL,
PRIMARY KEY (personID)
) ENGINE=InnoDB;
CREATE TABLE PersonAddress (
personID int NOT NULL,
addressID int NOT NULL,
KEY personID (personID),
KEY addressID (addressID),
FOREIGN KEY (personID) REFERENCES Person (personID),
FOREIGN KEY (addressID) REFERENCES Address (addressID)
) ENGINE=InnoDB;
CREATE TABLE PersonPhoneNumber (
personID int NOT NULL,
phoneNumberID int NOT NULL,
KEY personID (personID),
KEY phoneNumberID (phoneNumberID),
FOREIGN KEY (personID) REFERENCES Person (personID),
FOREIGN KEY (phoneNumberID) REFERENCES PhoneNumber (phoneNumberID)
) ENGINE=InnoDB;
CREATE TABLE Coach (
coachID int NOT NULL PRIMARY KEY REFERENCES Person (personID),
dateBeganCoaching varchar(10) NOT NULL
) ENGINE=InnoDB;
CREATE TABLE Player (
playerID int NOT NULL PRIMARY KEY REFERENCES Person (personID),
DOB varchar(10) NOT NULL,
schoolID int NOT NULL,
KEY schoolID (schoolID),
FOREIGN KEY (schoolID) REFERENCES School (schoolID)
) ENGINE=InnoDB;
CREATE TABLE Guardian (
guardianID int NOT NULL PRIMARY KEY REFERENCES Person (personID)
)ENGINE=InnoDB;
CREATE TABLE PlayerGuardian (
guardianID int NOT NULL,
playerID int NOT NULL,
KEY guardianID (guardianID),
KEY playerID (playerID),
FOREIGN KEY (guardianID) REFERENCES Guardian (guardianID),
FOREIGN KEY (playerID) REFERENCES Player (playerID)
) ENGINE=InnoDB;
CREATE TABLE TeamPlayer (
teamID int NOT NULL,
playerID int NOT NULL,
KEY teamID (teamID),
KEY playerID (playerID),
FOREIGN KEY (teamID) REFERENCES Team (teamID),
FOREIGN KEY (playerID) REFERENCES Player (playerID)
) ENGINE=InnoDB;
CREATE TABLE TeamCoach (
teamID int NOT NULL,
coachID int NOT NULL,
KEY teamID (teamID),
KEY coachID (coachID),
FOREIGN KEY (teamID) REFERENCES Team (teamID),
FOREIGN KEY (coachID) REFERENCES Coach (coachID)
) ENGINE=InnoDB;
CREATE TABLE CoachQualification (
coachID int NOT NULL,
qualificationID int NOT NULL,
KEY coachID (coachID),
KEY qualificationID (qualificationID),
FOREIGN KEY (coachID) REFERENCES Coach (coachID),
FOREIGN KEY (qualificationID) REFERENCES Qualification (qualificationID)
) ENGINE=InnoDB;
DELIMITER //
CREATE FUNCTION TeamSize(Team varchar(30))
RETURNS int
DETERMINISTIC CONTAINS SQL
BEGIN
DECLARE Size int;
SELECT COUNT(*) INTO Size FROM ((
SELECT * FROM TeamPlayer WHERE teamID=(
SELECT teamID FROM Team WHERE name='Red Bulls')))AS TeamSize;
RETURN Size;
END //
DELIMITER ;
这个用数据填充它的脚本：
INSERT INTO Qualification (name, level) VALUES ('Under 7s', '3');
INSERT INTO Qualification (name, level) VALUES ('Under 8s', '1');
INSERT INTO Qualification (name, level) VALUES ('Under 9s', '5');
INSERT INTO Qualification (name, level) VALUES ('Under 10s', '4');
INSERT INTO Qualification (name, level) VALUES ('Under 80s', '10');
INSERT INTO Team (name, ageGroup, year) VALUES ('Blue Hawks', 'Under 7s', '2015');
INSERT INTO Team (name, ageGroup, year) VALUES ('Yellow Dolphins', 'Under 8s', '2013');
INSERT INTO Team (name, ageGroup, year) VALUES ('Red Bulls', 'Under 9s', '2014');
INSERT INTO Team (name, ageGroup, year) VALUES ('Turquiose Turtles', 'Under 10s', '2015');
INSERT INTO Team (name, ageGroup, year) VALUES ('Violet Butterflies', 'Under 80s', '2015');
INSERT INTO Address (number, street, suburb, townCity) VALUES ('6', 'Selwyn Street', 'North East Valley', 'Dunedin');
INSERT INTO Address (number, street, suburb, townCity) VALUES ('6', 'Inverleith Street', 'Woodhaugh', 'Dunedin');
INSERT INTO Address (number, street, suburb, townCity) VALUES ('40', 'Chaucer Street', 'Milton', 'Milton');
INSERT INTO Address (number, street, suburb, townCity) VALUES ('105', 'Inniscort Street', 'Decent Part', 'Cromwell');
INSERT INTO Address (number, street, suburb, townCity) VALUES ('43', 'Chambers Street', 'North East Valley', 'Dunedin');
INSERT INTO PhoneNumber (number) VALUES ('034178669');
INSERT INTO PhoneNumber (number) VALUES ('0272637393');
INSERT INTO PhoneNumber (number) VALUES ('0277147957');
INSERT INTO PhoneNumber (number) VALUES ('0220826217');
INSERT INTO PhoneNumber (number) VALUES ('0800838383');
INSERT INTO School (name) VALUES ('Tokomairiro High');
INSERT INTO School (name) VALUES ('Cromwell College');
INSERT INTO School (name) VALUES ('Otago Boys');
INSERT INTO School (name) VALUES ('Otago Girls');
INSERT INTO School (name) VALUES ('Woodhaugh Rest Palace');
INSERT INTO Person (name, email, photo) VALUES ('Andrew Fletcher', 'gmail@gmail.com', 'puppy.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Sam Bates', 'outlook@outlook.com', 'kitten.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Mason Osbourne', 'yahoo@gmail.com', 'cheetah.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Zara DeMontgomery', 'hola@malware.com', 'elephant.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Reuben Crimp', 'norton@avg.com', 'dolphins.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Joy Gasson', 'example@example.com', 'owl.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Brian Treanor', 'www@www.com', 'whale.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Dale Parsons', 'java@oracle.com', 'swordfish.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Tom Clark', 'GNU@linux.com', 'lion.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Jim Beam', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Jack Daniels', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('John Snow', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Ned Stark', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Tywin Lannister', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Hodor Hodor', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Joe Bloggs', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('John Doe', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Jane Doe', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Lassie Dog', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO Person (name, email, photo) VALUES ('Jake Sully', 'mysql@databases.com', 'monkey.jpg');
INSERT INTO PersonAddress (personID, addressID) VALUES ('1', '3');
INSERT INTO PersonAddress (personID, addressID) VALUES ('2', '4');
INSERT INTO PersonAddress (personID, addressID) VALUES ('3', '5');
INSERT INTO PersonAddress (personID, addressID) VALUES ('4', '3');
INSERT INTO PersonAddress (personID, addressID) VALUES ('5', '2');
INSERT INTO PersonPhoneNumber (personID, phoneNumberID) VALUES ('1', '2');
INSERT INTO PersonPhoneNumber (personID, phoneNumberID) VALUES ('2', '4');
INSERT INTO PersonPhoneNumber (personID, phoneNumberID) VALUES ('3', '1');
INSERT INTO PersonPhoneNumber (personID, phoneNumberID) VALUES ('4', '5');
INSERT INTO PersonPhoneNumber (personID, phoneNumberID) VALUES ('5', '3');
INSERT INTO Coach (coachID, dateBeganCoaching) VALUES ('6', '2014');
INSERT INTO Coach (coachID, dateBeganCoaching) VALUES ('7', '2013');
INSERT INTO Coach (coachID, dateBeganCoaching) VALUES ('8', '2012');
INSERT INTO Coach (coachID, dateBeganCoaching) VALUES ('9', '2014');
INSERT INTO Coach (coachID, dateBeganCoaching) VALUES ('10', '1993');
INSERT INTO Player (playerID, DOB, schoolID) VALUES ('1', '08/07/1993', '1');
INSERT INTO Player (playerID, DOB, schoolID) VALUES ('2', '02/06/1993', '2');
INSERT INTO Player (playerID, DOB, schoolID) VALUES ('3', '08/04/1995', '1');
INSERT INTO Player (playerID, DOB, schoolID) VALUES ('4', '08/01/1994', '1');
INSERT INTO Player (playerID, DOB, schoolID) VALUES ('5', '25/12/1992', '5');
INSERT INTO Player (playerID, DOB, SchoolID) VALUES ('11', '06/07/1998', '3');
INSERT INTO Player (playerID, DOB, SchoolID) VALUES ('12', '06/07/1998', '3');
INSERT INTO Player (playerID, DOB, SchoolID) VALUES ('13', '06/07/1998', '4');
INSERT INTO Player (playerID, DOB, SchoolID) VALUES ('14', '06/07/1998', '5');
INSERT INTO Player (playerID, DOB, SchoolID) VALUES ('15', '06/07/1998', '4');
INSERT INTO Guardian (guardianID) VALUES ('16');
INSERT INTO Guardian (guardianID) VALUES ('17');
INSERT INTO Guardian (guardianID) VALUES ('18');
INSERT INTO Guardian (guardianID) VALUES ('19');
INSERT INTO Guardian (guardianID) VALUES ('20');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('16', '1');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('16', '2');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('17', '3');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('17', '4');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('18', '5');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('18', '11');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('19', '12');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('19', '13');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('20', '14');
INSERT INTO PlayerGuardian (guardianID, playerID) VALUES ('20', '15');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('1', '1');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('2', '2');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('3', '3');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('4', '4');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('5', '5');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('2', '11');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('4', '12');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('4', '13');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('3', '14');
INSERT INTO TeamPlayer (teamID, playerID) VALUES ('5', '15');
INSERT INTO TeamCoach (teamID, coachID) VALUES ('1', '6');
INSERT INTO TeamCoach (teamID, coachID) VALUES ('2', '7');
INSERT INTO TeamCoach (teamID, coachID) VALUES ('3', '8');
INSERT INTO TeamCoach (teamID, coachID) VALUES ('4', '9');
INSERT INTO TeamCoach (teamID, coachID) VALUES ('5', '10');
INSERT INTO CoachQualification (coachID, qualificationID) VALUES ('6', '5');
INSERT INTO CoachQualification (coachID, qualificationID) VALUES ('7', '4');
INSERT INTO CoachQualification (coachID, qualificationID) VALUES ('8', '3');
INSERT INTO CoachQualification (coachID, qualificationID) VALUES ('9', '2');
INSERT INTO CoachQualification (coachID, qualificationID) VALUES ('10', '1');
我想做的甚至可能吗？
答案 0 :(得分：1)
我试图创建一个适用于您的数据的查询，但这假设您每个玩家只有一个监护人（您在评论中说这是不可能的）。 Here是SQLFiddle，如果你想更多地使用它。
SELECT p.name, pg.name AS `GuardianName`, pgpn.`number` AS `GuardianNumber`
FROM `Player` play
LEFT JOIN `Person` p ON play.playerID = p.personID
LEFT JOIN `PlayerGuardian` g ON play.playerID = g.playerID
LEFT JOIN `Person` pg ON g.guardianID = pg.personID
LEFT JOIN `PersonPhoneNumber` pgppn ON pg.personID = pgppn.personID
LEFT JOIN `PhoneNumber` pgpn ON pgpn.phoneNumberID = pgppn.phoneNumberID
你遇到的问题是，你如何为每个玩家展示多个监护人？你想让玩家为每个玩家的监护人多次出现吗？然后你必须担心编码级别，这可能是一个很大的麻烦。
我的推荐：使用ORM类似CakePHP的{{3}}来完成繁重的工作。您可以在多个有效查询中设置表之间的关系，它将为您提供链接它们的魔力。