Getting Column Averages
|
/* mysql> SELECT AVG(Mark) AS AverageMark -> FROM StudentExam -> WHERE StudentID = 10; +-------------+ | AverageMark | +-------------+ | 73.3333 | +-------------+ 1 row in set (0.00 sec)
*/
/* Create table */ Drop TABLE StudentExam;
CREATE TABLE StudentExam ( StudentID INT NOT NULL, Mark INT, Comments VARCHAR(255) )TYPE = InnoDB;
/* Insert data */ INSERT INTO StudentExam (StudentID,Mark,Comments) VALUES (10,76,'Java'); INSERT INTO StudentExam (StudentID,Mark,Comments) VALUES (10,65,'C#'); INSERT INTO StudentExam (StudentID,Mark,Comments) VALUES (10,79,'JavaScript');
/* Real command */ SELECT AVG(Mark) AS AverageMark FROM StudentExam WHERE StudentID = 10;
|
|
|
|
|
Related Scripts with Example Source Code in same category :
-
-
-
|
|