1.sampdb所用到的表格
 sampdb關於學生考試的表格總共有四張，如下
學生信息表
MariaDB [sampdb]> select * from student;
+-----------+-----+------------+
| name      | sex | student_id |                     
+-----------+-----+------------+                     
| Megan     | F   |          1 |
| Joseph    | M   |          2 |
| Kyle      | M   |          3 |

學生成績表
MariaDB [sampdb]> select * from score;
+------------+----------+-------+
| student_id | event_id | score |
+------------+----------+-------+
|          1 |        1 |    20 |
|          3 |        1 |    20 |
|          4 |        1 |    18 |

測試考試統計表
MariaDB [sampdb]> select * from grade_event;
+------------+----------+----------+
| date       | category | event_id |
+------------+----------+----------+
| 2008-09-03 | Q        |        1 |
| 2008-09-06 | Q        |        2 |
| 2008-09-09 | T        |        3 |
| 2008-09-16 | Q        |        4 |
| 2008-09-23 | Q        |        5 |
| 2008-10-01 | T        |        6 |
+------------+----------+----------+

學生缺勤表
MariaDB [sampdb]> select * from absence;
+------------+------------+
| student_id | date       |
+------------+------------+
|          3 | 2008-09-03 |
|          5 | 2008-09-03 |
|         10 | 2008-09-06 |
|         10 | 2008-09-09 |
|         17 | 2008-09-07 |
|         20 | 2008-09-07 |


2.表格結構索引

   student

   | student | CREATE TABLE `student` (
  `name` varchar(20) NOT NULL,
  `sex` enum(‘F‘,‘M‘) NOT NULL,
  `student_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`student_id`)
) ENGINE=InnoDB AUTO_INCREMENT=32 DEFAULT CHARSET=latin1 |

   score
   
   | score | CREATE TABLE `score` (
  `student_id` int(10) unsigned NOT NULL,
  `event_id` int(10) unsigned NOT NULL,
  `score` int(11) NOT NULL,
  PRIMARY KEY (`event_id`,`student_id`),
  KEY `student_id` (`student_id`),
  CONSTRAINT `score_ibfk_1` FOREIGN KEY (`event_id`) REFERENCES `grade_event` (`event_id`),
  CONSTRAINT `score_ibfk_2` FOREIGN KEY (`student_id`) REFERENCES `student` (`student_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

  grade_event

  | grade_event | CREATE TABLE `grade_event` (
  `date` date NOT NULL,
  `category` enum(‘T‘,‘Q‘) NOT NULL,
  `event_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`event_id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=latin1 |

   absence

   | absence | CREATE TABLE `absence` (
  `student_id` int(10) unsigned NOT NULL,
  `date` date NOT NULL,
  PRIMARY KEY (`student_id`,`date`),
  CONSTRAINT `absence_ibfk_1` FOREIGN KEY (`student_id`) REFERENCES `student` (`student_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |


3.檢索數據

檢索統計參加event_id為1考試的學生人數

MariaDB [sampdb]> select count(student_id) from score where event_id=1;
+-------------------+
| count(student_id) |
+-------------------+
|                29 |
+-------------------+
1 row in set (0.00 sec)

 列出參加event_id為1考試的學生名單

MariaDB [sampdb]> select group_concat(student.name) from student left join score on student.student_id=score.student_id 
where score.event_id=1;
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| group_concat(student.name)                                                                                                                                                             |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Megan,Kyle,Katie,Abby,Nathan,Liesl,Ian,Colin,Peter,Michael,Thomas,Ben,Aubrey,Rebecca,Will,Max,Rianne,Avery,Lauren,
Becca,Gregory,Sarah,Robbie,Keaton,Carter,Teddy,Gabrielle,Grace,Emily |
+---------

檢索統計未參加event_id為1考試的學生人數

MariaDB [sampdb]> select count(student.student_id) from student left join (select * from score where event_id=1) as score1 on student.student_id=score1.student_id where score1.score is null;
+---------------------------+
| count(student.student_id) |
+---------------------------+
|                         2 |
+---------------------------+
1 row in set (0.00 sec)


列出未參加event_id為1考試的學生名單

MariaDB [sampdb]> select group_concat(student.name) from student left join (select * from score where event_id=1)
 as score1 on student.student_id=score1.student_id where score1.score is null;
+----------------------------+
| group_concat(student.name) |
+----------------------------+
| Joseph,Devri               |
+----------------------------+

檢索參加event_id為1考試的學生最高成績，平均成績，最低成績

  MariaDB [sampdb]> select max(score1.score),avg(score1.score),min(score1.score) from student left join (select * 
from score where event_id=1) as score1 on student.student_id=score1.student_id;
+-------------------+-------------------+-------------------+
| max(score1.score) | avg(score1.score) | min(score1.score) |
+-------------------+-------------------+-------------------+
|                20 |           15.1379 |                 9 |
+-------------------+-------------------+-------------------+

檢索參加event_id為1考試的最高成績的學生名字

select student.name from student left join score on student.student_id=score.student_id where  
score.event_id=1 and score=(select max(score) from score where event_id=1);
+--------+
| name   |
+--------+
| Megan  |
| Kyle   |
| Aubrey |
| Max    |
+--------+

減速參加event_id為1考試的最低成績的學生名字

MariaDB [sampdb]> select student.name,score from student left join score on student.student_id=score.student_id where  score.event_id=1 and  score=(select min(score) from score where event_id=1);
+--------+-------+
| name   | score |
+--------+-------+
| Will   |     9 |
| Rianne |     9 |
| Avery  |     9 |
+--------+-------+
3 rows in set (0.00 sec)

4.寫一個存儲過程，根據考試ID，列出這次考試多少人參加，列出參加學生的名字，多少人缺席，列出缺席的學生名字，
列出考試的最高成績的獲得者的名字和最高成績，最低成績的獲得者名字和最低成績，平均成績。

create procedure id_in(num int)
begin
select concat(‘考試人數‘),count(student_id) from score where event_id=num;        
select concat(‘參加考試名單‘),group_concat(name) from student left join score on student.student_id=score.student_id where event_id=num;        
select concat(‘缺席考試人數‘),count(name) from student left join (select * from score where event_id=num) as score1 on student.student_id=score1.student_id where score1.score is null;       
select concat(‘缺席考試名單‘),group_concat(name) from student left join (select * from score where event_id=num) as score1 on student.student_id=score1.student_id where score1.score is null;       
select concat(‘最高成績學生名單‘),group_concat(student.name) from student left join score on student.student_id=score.student_id where score.event_id=num and score=(select max(score) from score where score.event_id=num);         
select concat(‘最 低成績學生名單‘),group_concat(student.name) from student left join score on student.student_id=score.student_id where score.event_id=num and score=(select min(score) from score where score.event_id=num); 
select concat(‘最高成績‘),max(score1.score),concat(‘平均成績‘),avg(score1.score),concat(‘最低成績‘),min(score1.score) from student left join (select * from score where score.event_id=num) as score1 on student.student_id=score1.student_id; 
end$


結果：


MariaDB [sampdb]> call id_in(1);
+------------------------+-------------------+
| concat(‘考試人數‘)     | count(student_id) |
+------------------------+-------------------+
| 考試人數               |                29 |
+------------------------+-------------------+
1 row in set (0.01 sec)

+------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| concat(‘參加考試名單‘)       | group_concat(name)                                                                                                                                                                     |
+------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 參加考試名單                 | Megan,Kyle,Katie,Abby,Nathan,Liesl,Ian,Colin,Peter,Michael,Thomas,Ben,Aubrey,Rebecca,Will,Max,Rianne,Avery,Lauren,Becca,Gregory,Sarah,Robbie,Keaton,Carter,Teddy,Gabrielle,Grace,Emily |
+------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

+------------------------------+-------------+
| concat(‘缺席考試人數‘)       | count(name) |
+------------------------------+-------------+
| 缺席考試人數                 |           2 |
+------------------------------+-------------+
1 row in set (0.01 sec)

+------------------------------+--------------------+
| concat(‘缺席考試名單‘)       | group_concat(name) |
+------------------------------+--------------------+
| 缺席考試名單                 | Joseph,Devri       |
+------------------------------+--------------------+
1 row in set (0.01 sec)

+------------------------------------+----------------------------+
| concat(‘最高成績學生名單‘)         | group_concat(student.name) |
+------------------------------------+----------------------------+
| 最高成績學生名單                   | Megan,Kyle,Aubrey,Max      |
+------------------------------------+----------------------------+
1 row in set (0.01 sec)

+-------------------------------------+----------------------------+
| concat(‘最 低成績學生名單‘)         | group_concat(student.name) |
+-------------------------------------+----------------------------+
| 最 低成績學生名單                   | Will,Rianne,Avery          |
+-------------------------------------+----------------------------+
1 row in set (0.01 sec)

+------------------------+-------------------+------------------------+-------------------+------------------------+-------------------+
| concat(‘最高成績‘)     | max(score1.score) | concat(‘平均成績‘)     | avg(score1.score) | concat(‘最低成績‘)     | min(score1.score) |
+------------------------+-------------------+------------------------+-------------------+------------------------+-------------------+
| 最高成績               |                20 | 平均成績               |           15.1379 | 最低成績               |                 9 |
+------------------------+-------------------+------------------------+-------------------+------------------------+-------------------+
1 row in set (0.01 sec)

Query OK, 0 rows affected (0.01 sec)

本文出自 “gome學習” 博客，請務必保留此出處http://goome.blog.51cto.com/4045241/1964559

mysql sampdb數據庫存儲過程操作記錄