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MySQL存储过程中使用动态行转列

2019-01-04 17:00:30刘景俊

本文介绍的实例成功的实现了动态行转列。下面我以一个简单的数据库为例子，说明一下。

数据表结构

这里我用一个比较简单的例子来说明，也是行转列的经典例子，就是学生的成绩
三张表：学生表、课程表、成绩表

学生表
就简单一点，学生学号、学生姓名两个字段

CREATE TABLE `student` ( `stuid` VARCHAR(16) NOT NULL COMMENT '学号', `stunm` VARCHAR(20) NOT NULL COMMENT '学生姓名', PRIMARY KEY (`stuid`) ) COLLATE='utf8_general_ci' ENGINE=InnoDB;

课程表
课程编号、课程名

CREATE TABLE `courses` ( `courseno` VARCHAR(20) NOT NULL, `coursenm` VARCHAR(100) NOT NULL, PRIMARY KEY (`courseno`) ) COMMENT='课程表' COLLATE='utf8_general_ci' ENGINE=InnoDB;

成绩表
学生学号、课程号、成绩

CREATE TABLE `score` ( `stuid` VARCHAR(16) NOT NULL, `courseno` VARCHAR(20) NOT NULL, `scores` FLOAT NULL DEFAULT NULL, PRIMARY KEY (`stuid`, `courseno`) ) COLLATE='utf8_general_ci' ENGINE=InnoDB;

以上就是数据库表的结构了，这里没有建立外键，但是根据表的结构，可以清楚的看到成绩表中的学号和课程号是与学生表、课程表分别关联起来的。

数据准备

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/*学生表数据*/ Insert Into student (stuid, stunm) Values('1001', '张三'); Insert Into student (stuid, stunm) Values('1002', '李四'); Insert Into student (stuid, stunm) Values('1003', '赵二'); Insert Into student (stuid, stunm) Values('1004', '王五'); Insert Into student (stuid, stunm) Values('1005', '刘青'); Insert Into student (stuid, stunm) Values('1006', '周明'); /*课程表数据*/ Insert Into courses (courseno, coursenm) Values('C001', '大学语文'); Insert Into courses (courseno, coursenm) Values('C002', '新视野英语'); Insert Into courses (courseno, coursenm) Values('C003', '离散数学'); Insert Into courses (courseno, coursenm) Values('C004', '概率论与数理统计'); Insert Into courses (courseno, coursenm) Values('C005', '线性代数'); Insert Into courses (courseno, coursenm) Values('C006', '高等数学(一)'); Insert Into courses (courseno, coursenm) Values('C007', '高等数学(二)'); /*成绩表数据*/ Insert Into score(stuid, courseno, scores) Values('1001', 'C001', 67); Insert Into score(stuid, courseno, scores) Values('1002', 'C001', 68); Insert Into score(stuid, courseno, scores) Values('1003', 'C001', 69); Insert Into score(stuid, courseno, scores) Values('1004', 'C001', 70); Insert Into score(stuid, courseno, scores) Values('1005', 'C001', 71); Insert Into score(stuid, courseno, scores) Values('1006', 'C001', 72); Insert Into score(stuid, courseno, scores) Values('1001', 'C002', 87); Insert Into score(stuid, courseno, scores) Values('1002', 'C002', 88); Insert Into score(stuid, courseno, scores) Values('1003', 'C002', 89); Insert Into score(stuid, courseno, scores) Values('1004', 'C002', 90); Insert Into score(stuid, courseno, scores) Values('1005', 'C002', 91); Insert Into score(stuid, courseno, scores) Values('1006', 'C002', 92); Insert Into score(stuid, courseno, scores) Values('1001', 'C003', 83); Insert Into score(stuid, courseno, scores) Values('1002', 'C003', 84); Insert Into score(stuid, courseno, scores) Values('1003', 'C003', 85); Insert Into score(stuid, courseno, scores) Values('1004', 'C003', 86); Insert Into score(stuid, courseno, scores) Values('1005', 'C003', 87); Insert Into score(stuid, courseno, scores) Values('1006', 'C003', 88); Insert Into score(stuid, courseno, scores) Values('1001', 'C004', 88); Insert Into score(stuid, courseno, scores) Values('1002', 'C004', 89); Insert Into score(stuid, courseno, scores) Values('1003', 'C004', 90); Insert Into score(stuid, courseno, scores) Values('1004', 'C004', 91); Insert Into score(stuid, courseno, scores) Values('1005', 'C004', 92); Insert Into score(stuid, courseno, scores) Values('1006', 'C004', 93); Insert Into score(stuid, courseno, scores) Values('1001', 'C005', 77); Insert Into score(stuid, courseno, scores) Values('1002', 'C005', 78); Insert Into score(stuid, courseno, scores) Values('1003', 'C005', 79); Insert Into score(stuid, courseno, scores) Values('1004', 'C005', 80); Insert Into score(stuid, courseno, scores) Values('1005', 'C005', 81); Insert Into score(stuid, courseno, scores) Values('1006', 'C005', 82); Insert Into score(stuid, courseno, scores) Values('1001', 'C006', 77); Insert Into score(stuid, courseno, scores) Values('1002', 'C006', 78); Insert Into score(stuid, courseno, scores) Values('1003', 'C006', 79); Insert Into score(stuid, courseno, scores) Values('1004', 'C006', 80); Insert Into score(stuid, courseno, scores) Values('1005', 'C006', 81); Insert Into score(stuid, courseno, scores) Values('1006', 'C006', 82);