Using Analytic Functions: AVG(Mark) OVER (ORDER BY StudentID, Mark) : OVER « Analytical Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Analytical Functions » OVER 
16. 20. 7. Using Analytic Functions: AVG(Mark) OVER (ORDER BY StudentID, Mark)
SQL>
SQL>
SQL> CREATE TABLE SAT (
  2     StudentID  INT NOT NULL,
  3     ExamID     INT NOT NULL,
  4     Mark       INT,
  5     IfPassed   SMALLINT,
  6     Comments   VARCHAR(255),
  7     CONSTRAINT PK_SAT PRIMARY KEY (StudentID, ExamID));

Table created.

SQL>
SQL>
SQL> INSERT INTO SAT (StudentID,ExamID,Mark,IfPassed,CommentsVALUES (1,1,55,1,'Satisfactory');

row created.

SQL> INSERT INTO SAT (StudentID,ExamID,Mark,IfPassed,CommentsVALUES (1,2,73,1,'Good result');

row created.

SQL> INSERT INTO SAT (StudentID,ExamID,Mark,IfPassed,CommentsVALUES (2,3,44,1,'Hard');

row created.

SQL> INSERT INTO SAT (StudentID,ExamID,Mark,IfPassed,CommentsVALUES (2,5,39,0,'Simple');

row created.

SQL> INSERT INTO SAT (StudentID,ExamID,Mark,IfPassedVALUES (2,6,63,1);

row created.

SQL>
SQL>
SQL>
SQL> SELECT StudentID, Mark, AVG(MarkOVER
  2  (ORDER BY StudentID, MarkRunning_Average
  3  FROM SAT
  4  ORDER BY StudentID, Mark;

 STUDENTID       MARK RUNNING_AVERAGE
---------- ---------- ---------------
         1         55              55
         1         73              64
         2         39      55.6666667
         2         44           52.75
         2         63            54.8

rows selected.

SQL>
SQL>
SQL>
SQL>
SQL> drop table SAT;

Table dropped.
16. 20. OVER
16. 20. 1. AVG(salary) OVER
16. 20. 2. ROUND(AVG(salary) OVER())
16. 20. 3. Use partitioning in the OVER clause of the aggregate-analytical function
16. 20. 4. Ratio-to-Report
16. 20. 5. Using Analytic Functions AVG(Mark) OVER (PARTITION BY StudentID ORDER BY StudentID, Mark)
16. 20. 6. Using Analytic Functions: AVG(Mark) OVER
16. 20. 7. Using Analytic Functions: AVG(Mark) OVER (ORDER BY StudentID, Mark)
16. 20. 8. Using Analytic Functions: AVG(Mark) OVER(PARTITION BY StudentID ORDER BY StudentID, Mark RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
16. 20. 9. sum over (nothing)
16. 20. 10. sum over partition by, order by
16. 20. 11. sum salary over PARTITION BY
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