Question

我是这个领域的新手，我正在制定学费管理系统，按月收取学费，每年等等。

我的MySQL数据库架构如下

academic_classes 表

class_id class_name 1月1日

2 2nd

.....等等

Fee_types 表

fee_type_id            fee_name
     1                     Admission Fee

     2                     Tuition Fee

     3                     Sports Fee

class_wise_fee_plan 表格

plan_id class_id fee_id金额 1 1 1 5000

 2                1                  2                 1150

 3                 1                 3                    350

费用金额根据班级而定根据你的建议我添加了一张新表每年，每月等费用频率

fee_writeoff 表

fee_writeoff_id fee_id个月 1 1 apr

    2                         2                    jan

    3                         2                    feb

依旧......

前端有<12个月的12个复选框，如何根据复选框计算或显示费用值和费用名称。

我想要这种类型的结果

FeeName Apr May Jun ..... Total

入场费5000 0 0 5000

Tution Fee 1100 1100 1100 3300

总计6100 1100 1100 8300

如果从前端的复选框中选择月份名称，如何创建mysql存储过程，因为月份名称是逗号saparated如何循环并创建案例

Answer 1

使用CASE尝试以下查询，它不是您要求的完整解决方案，但这将解决您的一些问题。

SELECT ft.fee_name, (CASE WHEN apr=1 THEN fee_amount ELSE 0 END) AS apr,
(CASE WHEN may=1 THEN fee_amount ELSE 0 END) AS apr,
(CASE WHEN jun=1 THEN fee_amount ELSE 0 END) AS apr,
(CASE WHEN jul=1 THEN fee_amount ELSE 0 END) AS apr,
(CASE WHEN aug=1 THEN fee_amount ELSE 0 END) AS apr,
(CASE WHEN apr=1 THEN fee_amount ELSE 0 END) AS apr,
FROM fee_type ft INNER JOIN fee_plan fp
USING (fee_id)

<强>输出

fee_name           APR    MAY    JUNE     JULY     AUG

Admission Fee      5000    0        0        0       0

Tuition Fee        1150   1150   1150     1150     1150

Answer 2

首先我要注意，要设计模式，您应该了解关系模型的基础知识。当您将电子表格布局放到关系表中时，您将无法正确使用它。

所以我在关系问题上重新设计了你的模式。它不是唯一可能的架构，但它取决于您的应用程序的其余部分。

模式的

CREATE TABLE `fee` (
  `fee_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(32) NOT NULL,
  PRIMARY KEY (`fee_id`) 
) ENGINE = InnoDB;

CREATE TABLE `fee_writeoff` (
  `fee_writeoff_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `fee_id` INT UNSIGNED NULL,
  `date` DATE NOT NULL,
  PRIMARY KEY (`fee_writeoff_id`),
  INDEX `fee_id`(`fee_id`),
  CONSTRAINT `fee_writeoff_has_fee`
    FOREIGN KEY (`fee_id`)
    REFERENCES `fee` (`fee_id`)
    ON DELETE RESTRICT
    ON UPDATE CASCADE
) ENGINE = InnoDB;

CREATE TABLE `fee_plan` (
  `fee_plan_id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `fee_id` INT UNSIGNED NOT NULL,
  `amount` DECIMAL(10,0) NOT NULL,
  PRIMARY KEY (`fee_plan_id`),
  INDEX `fee_id`(`fee_id`),
  CONSTRAINT `fee_plan_has_fee`
    FOREIGN KEY (`fee_id`)
    REFERENCES `fee` (`fee_id`)
    ON DELETE RESTRICT
    ON UPDATE CASCADE  
) ENGINE = InnoDB;

数据

INSERT INTO `fee`(`fee_id`, `name`) VALUES
  (1, 'Admission Fee'),
  (2, 'Tuition Fee');

INSERT INTO `fee_writeoff`(`fee_id`, `date`) VALUES
  (1, '2000-04-01'),
  (2, '2000-01-01'),
  (2, '2000-02-01'),
  (2, '2000-03-01'),
  (2, '2000-04-01'),
  (2, '2000-05-01'),
  (2, '2000-06-01'),
  (2, '2000-07-01'),
  (2, '2000-08-01'),
  (2, '2000-09-01'),
  (2, '2000-10-01'),
  (2, '2000-11-01'),
  (2, '2000-12-01');

INSERT INTO `fee_plan`(`fee_id`, `amount`) VALUES
  (1, 5000),
  (2, 1150);

查询

SELECT 
  name,
  SUM(CASE MONTH(`date`) WHEN  4 THEN amount ELSE 0 END) AS `April`,
  SUM(CASE MONTH(`date`) WHEN  5 THEN amount ELSE 0 END) AS `May`,
  SUM(CASE MONTH(`date`) WHEN  6 THEN amount ELSE 0 END) AS `June`,
  SUM(CASE MONTH(`date`) WHEN  7 THEN amount ELSE 0 END) AS `July`,
  SUM(CASE MONTH(`date`) WHEN  8 THEN amount ELSE 0 END) AS `August`,
  SUM(CASE MONTH(`date`) WHEN  9 THEN amount ELSE 0 END) AS `September`,
  SUM(CASE MONTH(`date`) WHEN 10 THEN amount ELSE 0 END) AS `October`,
  SUM(CASE MONTH(`date`) WHEN 11 THEN amount ELSE 0 END) AS `November`,
  SUM(CASE MONTH(`date`) WHEN 12 THEN amount ELSE 0 END) AS `December`,
  SUM(CASE MONTH(`date`) WHEN  1 THEN amount ELSE 0 END) AS `January`,
  SUM(CASE MONTH(`date`) WHEN  2 THEN amount ELSE 0 END) AS `February`,
  SUM(CASE MONTH(`date`) WHEN  3 THEN amount ELSE 0 END) AS `March`,
  SUM(amount) AS `Total`
FROM fee
JOIN fee_writeoff USING(fee_id)
JOIN fee_plan USING(fee_id)
GROUP BY name WITH ROLLUP

这是the SQLFiddle snippet。

如何从复选框中选择月份收取月薪学费？

2 个答案: