PTA queries the student numbers and average grades of students who have taken more than 2 courses. score 3

Question stem:

Query the student numbers and average grades of students who have taken more than 2 courses.

Tips: Please use the SELECT statement to answer, and the average score is rounded up to keep 1 valid figure.

Table Structure:

The SQL statement defining the table structure is as follows:

CREATE TABLE score (

sno varchar(6) NOT NULL,

cno varchar(6) NOT NULL,

term varchar(15),

grade int(11),

PRIMARY KEY (sno,cno)

) ;

table sample

The table sample corresponding to the above table structure, some data are as follows:

score table:

Sample output:

Sample output:

Code length limit 16 KB

Time limit 400 ms

DatabaseMySQL

The result output requires a strict comparison of the order and data

select sno 学号, round(avg(grade),1) 平均成绩
from score
group by sno
having count(sno) >= 2

Guess you like

Origin blog.csdn.net/weixin_70206677/article/details/129345036