Subqueries That Return Multiple Results : Sub query « Select Clause « SQL / MySQL






  1. SQL / MySQL
  2. Select Clause
  3. Sub query

Subqueries That Return Multiple Results

   
/*
mysql> select * from Course;
+----------+----------------------+---------+
| CourseID | Name                 | Credits |
+----------+----------------------+---------+
|        1 | Mediaeval Romanian   |       5 |
|        2 | Philosophy           |       5 |
|        3 | History of Computing |       5 |
+----------+----------------------+---------+
3 rows in set (0.00 sec)

mysql> SELECT Name FROM Course
    -> WHERE CourseID IN
    -> (
    -> SELECT CourseID from EXAM
    -> WHERE SustainedOn='26-MAR-03'
    -> );
Empty set, 1 warning (0.00 sec)


*/

Drop TABLE Course;
Drop TABLE Exam;       
       
CREATE TABLE Course (
   CourseID INT NOT NULL PRIMARY KEY,
   Name     VARCHAR(50),
   Credits  INT)
TYPE = InnoDB;

CREATE TABLE Exam (
   ExamID      INT NOT NULL PRIMARY KEY,
   CourseID    INT NOT NULL,
   SustainedOn DATE,
   Comments    VARCHAR(255),

   INDEX       examcourse_index(CourseID)
   
 
)TYPE = InnoDB;


INSERT INTO Course (CourseID,Name,Credits) VALUES (1,'Mediaeval Romanian',5);
INSERT INTO Course (CourseID,Name,Credits) VALUES (2,'Philosophy',5);
INSERT INTO Course (CourseID,Name,Credits) VALUES (3,'History of Computing',5);

INSERT INTO Exam (ExamID,CourseID,SustainedOn,Comments) VALUES 
      (1,1,'2003-03-12','JavaScript');
      
INSERT INTO Exam (ExamID,CourseID,SustainedOn,Comments) VALUES 
      (2,1,'2003-03-13','Java');
      
INSERT INTO Exam (ExamID,CourseID,SustainedOn,Comments) VALUES 
      (3,2,'2003-03-11','Python');
      
INSERT INTO Exam (ExamID,CourseID,SustainedOn) VALUES 
      (4,3,'2003-03-18','Swing');


select * from Course;
  
SELECT Name FROM Course
WHERE CourseID IN
(
SELECT CourseID from EXAM
WHERE SustainedOn='26-MAR-03'
);








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