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CREATE TABLE Person (#Superclass
PPS varchar(9) NOT NULL PRIMARY KEY,
fName varchar(20) NOT NULL,
lName varchar(20) NOT NULL,
DOB date NOT NULL,
gender enum('M','F') NOT NULL DEFAULT 'M',
email varchar(25) NOT NULL,
contactNo varchar(10) NOT NULL,
city varchar(10) NOT NULL,
street varchar(20) NOT NULL
);
CREATE TABLE Donor (#Subclass
PPS varchar(9) NOT NULL PRIMARY KEY REFERENCES Person(PPS),
timesOfDonations int(1) NOT NULL DEFAULT '0'
);
CREATE TABLE Doctor(#Subclass
PPS varchar(9) NOT NULL PRIMARY KEY REFERENCES Person(PPS),
speciality varchar(20) NOT NULL,
workHours int(3)
);
CREATE TABLE Health_Check (
hId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
bloodPressure varchar(7) NOT NULL,
weight float(4,1) NOT NULL,
height float(4,1) NOT NULL,
heartRate int(3) NOT NULL,
temprature float(3,1) NOT NULL,
alcoholicTest enum('P','F') NOT NULL DEFAULT 'P',
dateOfCheck date,
doctorId varchar(9),
donorId varchar(9)
);
ALTER TABLE Health_Check
ADD CONSTRAINT donorH_fk FOREIGN KEY (donorId) REFERENCES Donor (PPS) ON DELETE RESTRICT ON UPDATE CASCADE,
ADD CONSTRAINT doctor_fk FOREIGN KEY (doctorId) REFERENCES Doctor (PPS) ON DELETE RESTRICT ON UPDATE CASCADE;
#List the doctors and the names of the donors they examined during the last week.
CREATE VIEW DoctorsAndDonors AS
SELECT * FROM (SELECT concat(fname, ' ', lName) AS'Doctor Name' FROM Person JOIN Doctor on Person.PPS=Doctor.PPS
JOIN Health_Check on Doctor.PPS = Health_Check.doctorId WHERE DATEDIFF(CURDATE(), dateOfCheck) BETWEEN 1 AND 7
UNION ALL
SELECT concat(fname, ' ', lName) AS'Donor Name' FROM Person JOIN Donor on Person.PPS=Donor.PPS
JOIN Health_Check on Donor.PPS = Health_Check.donorId WHERE DATEDIFF(CURDATE(), dateOfCheck) BETWEEN 1 AND 7) AS a;
은 위의보기는 올바른 결과를 반환하지만, 의사와 기증자의 이름은 레이블 "의사 이름"에서 하나 개의 컬럼에 있습니다. 내 질문 : 두 개의 열을 하나씩 만들 수있는 방법이 있나요? 하나는 의사의 이름을 표시하고 두 번째는 기증자의 이름을 보여줍니다.은 - MySQL의
감사합니다.