我想写mysql查询

打印除JR以外的所有级别的级别和该级别学生的平均年龄

CREATE TABLE STUDENT (
    sid NUMERIC(6) NOT NULL,
    sname VARCHAR(15),
    major VARCHAR(20),
    level VARCHAR(2),
    sage NUMERIC(2) NOT NULL,
    PRIMARY KEY (sid)
);

INSERT INTO STUDENT (sid, sname, major, level, sage) values (1,'JOHN','EE','FR' ,18);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (2,'TIM','EE','FR',19);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (3,'RICHARD','EE','SO',20);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (4,'EDWARD','EE','SO',21);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (5,'ALBER','CS','JR',22);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (6,'MARY','EE','JR',22);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (7,'JACK','EE','SR',23);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (8,'JULIAN','EE','SR',22);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (9,'SAM','EE','SR',24);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (10,'RAM','CS','SR',23);
INSERT INTO STUDENT (sid, sname, major, level, sage) values (11,'RICK','EE','SR',24);

选择级别，平均年龄 来自学生 “JR”级在哪里 逐级分组

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嗯。你写下它，然后带着一个特定的问题回来。你应该真正展示你所做的尝试+0以闪电般的速度给那个人一条鱼@我想我是觉得自己很慷慨我完全理解；我有时也会感到内疚，无法迅速给出最佳答案，即使它有时会缩短过程。

  SELECT level, AVG(sage) AS AvgAge
    FROM STUDENT
   WHERE level != 'JR'
GROUP BY level