SUM calculates and displays the sum of an expression recorded in the database within a certain range.

For example, if you want to count the number of students with a math score of 90 or above in the student report, use the count command.

Use student grades

Math Score > =90 to yx Count

? yx

use

If you want to count the average score of mathematics (assuming there are 60 people), you need to use sum.

Use student grades

Add math scores to zcj

pj=zcj/60

? pj

use