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我有这个大学数据库。我必须检索与名为“John”的讲师一起类的学生的学生 ID。
到目前为止
SELECT student_id
FROM enrolls
JOIN teaches ON enrolls.number=teaches.number
WHERE Instructor.name=(
SELECT name
FROM Instructor
WHERE name='john'
);
但这不起作用。
create table Course (
number int,
title varchar(255),
credits int,
syllabus varchar(255),
PRIMARY KEY (number)
);
INSERT INTO Course VALUES (620,'Algorithm',3,'XYZ');
INSERT INTO Course VALUES (232,'Java',2,'ABC');
INSERT INTO Course VALUES (420,'Cpp',2,'PQRS');
INSERT INTO Course VALUES (720,'Big Data',3,'NVGY');
INSERT INTO Course VALUES (120,'Intelligent System',4,'KJHU');
INSERT INTO Course VALUES (220,'Operating System',3,'GED');
INSERT INTO Course VALUES (480,'Graphics',4,'RSFN');
INSERT INTO Course VALUES (520,'Distributed Networks',3,'NHU');
INSERT INTO Course VALUES (820,'Data Mining',3,'TYU');
INSERT INTO Course VALUES (700,'Cryptography',1,'MNO');
create table Student (
student_id int,
name varchar(255),
department varchar(255),
PRIMARY KEY (student_id)
);
INSERT INTO Student VALUES (2345,'Mike','Computer Science');
INSERT INTO Student VALUES (346,'Rob','Computer Science');
INSERT INTO Student VALUES (789,'Nick','Game Design');
INSERT INTO Student VALUES (675,'Sara','Computer Science');
INSERT INTO Student VALUES (123,'Raj','Mechanical');
INSERT INTO Student VALUES (5331,'Jack','Biotech');
INSERT INTO Student VALUES (1023,'Michelle','Chemical');
INSERT INTO Student VALUES (9800,'Jie','Industrial');
INSERT INTO Student VALUES (7834,'Dan','Petroleum');
INSERT INTO Student VALUES (4567,'Patrick','Computer Science');
create table Instructor (
instructor_id int,
name varchar(255),
department varchar(255),
title varchar(255),
PRIMARY KEY (instructor_id)
);
INSERT INTO Instructor VALUES (12,'John','Computer Science','Java');
INSERT INTO Instructor VALUES (23,'Bischof','Mechanical','Drawing');
INSERT INTO Instructor VALUES (56,'Kwon','Biotech','Biology');
INSERT INTO Instructor VALUES (78,'Deever','Security','Cryptography');
INSERT INTO Instructor VALUES (45,'Jin','Computer Science','Cpp');
INSERT INTO Instructor VALUES (67,'Bailey','Petroleum','Metalurgy');
INSERT INTO Instructor VALUES (90,'Richard','Industrial','Manufacture');
INSERT INTO Instructor VALUES (11,'Joe','Chemical','Chemistry');
INSERT INTO Instructor VALUES (24,'Roger','Game Design','Cpp');
INSERT INTO Instructor VALUES (55,'Zack','Industria','Design');
create table CourseOffering (
number int,
year int,
semester int,
section_number int,
classroom int,
PRIMARY KEY (number,year,semester,section_number),
FOREIGN KEY (number) REFERENCES Course (number)
);
INSERT INTO CourseOffering VALUES (620,2012,2,102,3540);
INSERT INTO CourseOffering VALUES (232,2011,1,103,3455);
INSERT INTO CourseOffering VALUES (420,2013,3,101,2650);
INSERT INTO CourseOffering VALUES (720,2013,3,100,3455);
INSERT INTO CourseOffering VALUES (120,2014,1,102,3000);
INSERT INTO CourseOffering VALUES (220,2008,2,104,1450);
INSERT INTO CourseOffering VALUES (480,2009,4,106,1400);
INSERT INTO CourseOffering VALUES (520,2010,3,102,3500);
INSERT INTO CourseOffering VALUES (820,2008,3,100,2700);
INSERT INTO CourseOffering VALUES (700,2012,1,103,2540);
create table CourseOffering_Timing (
number int,
year int,
semester int,
section_number int,
timing int,
PRIMARY KEY (number,year,semester,section_number,timing),
FOREIGN KEY (number) REFERENCES Course (number)
);
INSERT INTO CourseOffering_Timing VALUES (620,2012,2,102,9);
INSERT INTO CourseOffering_Timing VALUES (232,2011,1,103,3);
INSERT INTO CourseOffering_Timing VALUES (420,2013,3,101,2);
INSERT INTO CourseOffering_Timing VALUES (720,2013,3,100,5);
INSERT INTO CourseOffering_Timing VALUES (120,2014,1,102,4);
INSERT INTO CourseOffering_Timing VALUES (220,2008,2,104,10);
INSERT INTO CourseOffering_Timing VALUES (480,2009,4,106,12);
INSERT INTO CourseOffering_Timing VALUES (520,2010,3,102,4);
INSERT INTO CourseOffering_Timing VALUES (820,2008,3,100,2);
INSERT INTO CourseOffering_Timing VALUES (700,2012,1,103,3);
create table PreRequisite (
number int,
prerequisite_number int,
PRIMARY KEY (number,prerequisite_number),
FOREIGN KEY (number) REFERENCES Course(number)
);
INSERT INTO PreRequisite VALUES (620,480);
INSERT INTO PreRequisite VALUES (232,120);
INSERT INTO PreRequisite VALUES (420,320);
INSERT INTO PreRequisite VALUES (720,580);
INSERT INTO PreRequisite VALUES (120,110);
INSERT INTO PreRequisite VALUES (220,130);
INSERT INTO PreRequisite VALUES (480,380);
INSERT INTO PreRequisite VALUES (520,360);
INSERT INTO PreRequisite VALUES (820,700);
INSERT INTO PreRequisite VALUES (700,610);
create table enrolls (
student_id int,
number int,
year int,
semester int,
section_number int,
grade varchar(10),
PRIMARY KEY (student_id,number,year,semester,section_number),
FOREIGN KEY (number,year,semester,section_number) REFERENCES CourseOffering(number,year,semester,section_number),
FOREIGN KEY (student_id) REFERENCES Student (student_id)
);
INSERT INTO enrolls VALUES (2345,620,2012,2,102,'A');
INSERT INTO enrolls VALUES (346,232,2011,1,103,'B');
INSERT INTO enrolls VALUES (789,420,2013,3,101,'A');
INSERT INTO enrolls VALUES (675,720,2013,3,100,'C');
INSERT INTO enrolls VALUES (123,120,2014,1,102,'B');
INSERT INTO enrolls VALUES (5331,220,2008,2,104,'A');
INSERT INTO enrolls VALUES (1023,480,2009,4,106,'B');
INSERT INTO enrolls VALUES (9800,520,2010,3,102,'A');
INSERT INTO enrolls VALUES (7834,820,2008,3,100,'C');
INSERT INTO enrolls VALUES (4567,700,2012,1,103,'F');
create table teaches (
instructor_id int,
number int,
year int,
semester int,
section_number int,
PRIMARY KEY (instructor_id, number, year, semester, section_number),
FOREIGN KEY (instructor_id) REFERENCES Instructor(instructor_id),
FOREIGN KEY ( number, year, semester, section_number) REFERENCES CourseOffering( number, year, semester, section_number)
);
INSERT INTO teaches VALUES (12,620,2012,2,102);
INSERT INTO teaches VALUES (23,232,2011,1,103);
INSERT INTO teaches VALUES (56,420,2013,3,101);
INSERT INTO teaches VALUES (78,720,2013,3,100);
INSERT INTO teaches VALUES (45,120,2014,1,102);
INSERT INTO teaches VALUES (67,220,2008,2,104);
INSERT INTO teaches VALUES (90,480,2009,4,106);
INSERT INTO teaches VALUES (11,520,2010,3,102);
INSERT INTO teaches VALUES (24,820,2008,3,100);
INSERT INTO teaches VALUES (55,700,2012,1,103);
最佳答案
您的 WHERE 子句需要引用您已选择或连接的表之一,即 enrolls
和 teaches
。因此,您必须执行类似 WHEREeachs.instructor_id=(SELECT coach_id FROM Instructor WHERE name='john');
PS:您可能还想在顶级选择中抛出一个 DISTINCT。
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