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以mysql为例，汇总sql查询最高分、最低分、平均分等sql语句，oracle语法类似，可自行修改以下sql语句
创建两个数据库表，一个学生表、一个考试成绩表
计算
安全
数据库
网络和加速
企业服务
DROP TABLE IF EXISTS `score`;
CREATE TABLE `score` (
`u_id` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '编号',
`object_no` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '课程编号',
`students_no` varchar(11) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '学号',
`score` int(11) NULL DEFAULT NULL COMMENT '分数'
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
INSERT INTO `score` VALUES ('1', '100', 's100', 80);
INSERT INTO `score` VALUES ('2', '100', 's200', 59);
INSERT INTO `score` VALUES ('3', '100', 's300', 79);
INSERT INTO `score` VALUES ('4', '200', 's100', 54);
INSERT INTO `score` VALUES ('5', '200', 's200', 96);
INSERT INTO `score` VALUES ('6', '200', 's300', 74);
INSERT INTO `score` VALUES ('7', '300', 's100', 65);
INSERT INTO `score` VALUES ('8', '300', 's200', 80);
INSERT INTO `score` VALUES ('9', '200', 's400', 62);
INSERT INTO `score` VALUES ('10', '300', 's400', 56);
INSERT INTO `score` VALUES ('11', '100', 's400', 70);
SET FOREIGN_KEY_CHECKS = 1;
DROP TABLE IF EXISTS `students`;
CREATE TABLE `students` (
`students_no` varchar(12) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '编号',
`students_name` varchar(12) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '姓名',
`sex` varchar(1) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '性别',
PRIMARY KEY (`students_no`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
INSERT INTO `students` VALUES ('s100', '张三', '1');
INSERT INTO `students` VALUES ('s200', '李四', '2');
INSERT INTO `students` VALUES ('s300', '张三', '1');
INSERT INTO `students` VALUES ('s400', '王五', '1');
SET FOREIGN_KEY_CHECKS = 1;
select object_no as '课程编号', count(DISTINCT students_no) '考试人数' from score group by object_no
select object_no as '课程编号',max(score) as '最高分',min(score) as '最低分' from score group by object_no
查询每门课程被选修的学生数
select object_no as '课程编号', count(DISTINCT students_no) as '学生编号' from score group by object_no
select sex '性别',count(DISTINCT students_no) '数量' from students group by sex
select students_no as '学生编号',avg(score) as '平均成绩' from score group by students_no
select students_no as '学生编号',avg(score) as '平均成绩' from score group by students_no HAVING avg(score)>70
select students_no as '学生编号',count(object_no) as '课程编号' from score group by students_no
select students_no as '学生编号',count(object_no) as '课程编号' from score group by students_no HAVING count( object_no)>2
select students_name as '学生名称',count(students_name) as '同名数量' from students group by students_name HAVING count(students_name)>1
select object_no as '课程编号',avg(score) as '平均成绩' from score group by object_no
select object_no as '课程编号',avg(score) as '平均成绩' from score group by object_no HAVING avg(score)>70
select object_no as '课程编号',students_no '学生编号',score '分数' from score where score<60 order by object_no desc
select object_no as '课程编号',avg(score) as '平均成绩' from score group by object_no order by avg(score) desc,object_no asc
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