Assume there is a column named MARKS in the table STUDENT_DETAILS, and we need to calculate the average. The following query will be necessary:
SELECT AVG(MARKS) AVERAGE FROM STUDENT_DETAILS;
This will calculate and display the average of the available values in the MARKS column as below.
Assuming the values as 5,6 and 7 in three rows, it works as below.
+ -- -- -- -- -- -+| AVERAGE |+ -- -- -- -- -- -+| 6.0000 |+ -- -- -- -- -- -+
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