簡單描述：
成績表中有學生姓名、學生科目以及學生分數。查詢分數最高和分數最低的學生的以及學生的分數。注意的點如下：

1、group by，select 選擇的列，必須是group by 中的列，或者是函數形式。
2、利用MAX（） 和MIN（）sql函數。
3、建立的表結構如下。

-- ---------------------------- -- Table structure for grade -- ---------------------------- DROP TABLE IF EXISTS `grade`; CREATE TABLE `grade` (`stu_name` varchar(255) NOT NULL,`stu_subject` varchar(255) NOT NULL,`score` int(255) DEFAULT NULL,PRIMARY KEY (`stu_subject`,`stu_name`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1;-- ---------------------------- -- Records of grade -- ---------------------------- INSERT INTO `grade` VALUES ('lilei', 'shuxue', '99'); INSERT INTO `grade` VALUES ('xiaoyong', 'shuxue', '66'); INSERT INTO `grade` VALUES ('lilei', 'yingyu', '80'); INSERT INTO `grade` VALUES ('xiaoyong', 'yingyu', '55'); INSERT INTO `grade` VALUES ('lilei', 'yuwen', '78'); INSERT INTO `grade` VALUES ('xiaoyong', 'yuwen', '88');

思路
1)按照科目分組查詢成績最高的人
SELECT grade.stu_subject, MAX(grade.score) as score from grade GROUP BY stu_subject;
2)顯示出成績最高的人的姓名和科目名稱
SELECT grade.* from grade,
(SELECT grade.stu_subject, MAX(grade.score) as score from grade GROUP BY stu_subject )b
WHERE grade.score = b.score and grade.stu_subject = b.stu_subject;
3)顯示出列標題.
SELECT “成績最高”,grade.* from grade,
(SELECT grade.stu_subject, MAX(grade.score) as score from grade GROUP BY stu_subject )b
WHERE grade.score = b.score and grade.stu_subject = b.stu_subject;

成績最低的也是如此就是利用MIN()函數, 如果需要同時查出, 可以用union 如下sql

SELECT "成績最高",grade.* from grade, (SELECT grade.stu_subject, MAX(grade.score) as score from grade GROUP BY stu_subject )b WHERE grade.score = b.score and grade.stu_subject = b.stu_subject UNION SELECT "成績最低",grade.* from grade, (SELECT grade.stu_subject, MIN(grade.score) as score from grade GROUP BY stu_subject )b WHERE grade.score = b.score and grade.stu_subject = b.stu_subject;

查詢結果如下圖所示:

總結:
路漫漫其修遠兮,吾將上下而求索。

總結

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