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

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SQL / MySQL » Select Clause » 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,CreditsVALUES (1,'Mediaeval Romanian',5);
INSERT INTO Course (CourseID,Name,CreditsVALUES (2,'Philosophy',5);
INSERT INTO Course (CourseID,Name,CreditsVALUES (3,'History of Computing',5);

INSERT INTO Exam (ExamID,CourseID,SustainedOn,CommentsVALUES 
      (1,1,'2003-03-12','JavaScript');
      
INSERT INTO Exam (ExamID,CourseID,SustainedOn,CommentsVALUES 
      (2,1,'2003-03-13','Java');
      
INSERT INTO Exam (ExamID,CourseID,SustainedOn,CommentsVALUES 
      (3,2,'2003-03-11','Python');
      
INSERT INTO Exam (ExamID,CourseID,SustainedOnVALUES 
      (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'
);

           
       
Related examples in the same category
1. Subqueries As Calculated Columns: Simple Subqueries
2. Subqueries in the WHERE Clause 2
3. Sub queries
4. Sub query with string concatenate
5. Sub query with not equal and order
6. Sub query with calculation
7. Sub query with ANY command
8. Sub query with ALL command
9. Sub query with IN command
10. Sub query with NOT IN command
11. Sub query with EXISTS command
12. Sub query with NOT EXISTS command
13. Update command with sub query
14. Delete command with sub query
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