Question

我有两个表的学生和班级费用，我想获得报告以查看学生是否支付了费用。

我尝试了这个mysql查询，这是我真正想要的，但是月份和年份也存在问题，即时消息也变成了空列。

这是我尝试过的查询


    SELECT
        student.stu_name,
        SUM(IF(MONTH(fees.date) = 1, fees.amt, 0)) AS Jan,
        SUM(IF(MONTH(fees.date) = 2, fees.amt, 0)) AS Feb,
        SUM(IF(MONTH(fees.date) = 3, fees.amt, 0)) AS Mar,
        SUM(IF(MONTH(fees.date) = 4, fees.amt, 0)) AS Apr,
        SUM(IF(MONTH(fees.date) = 5, fees.amt, 0)) AS May,
        SUM(IF(MONTH(fees.date) = 6, fees.amt, 0)) AS Jun,
        SUM(IF(MONTH(fees.date) = 7, fees.amt, 0)) AS Jul,
        SUM(IF(MONTH(fees.date) = 8, fees.amt, 0)) AS Aug,
        SUM(IF(MONTH(fees.date) = 9, fees.amt, 0)) AS Sep,
        SUM(IF(MONTH(fees.date) = 10, fees.amt, 0)) AS Oct,
        SUM(IF(MONTH(fees.date) = 11, fees.amt, 0)) AS Nov,
        SUM(IF(MONTH(fees.date) = 12, fees.amt, 0)) AS Dece,
        SUM(fees.amt) AS Total,
        (28000-(SUM(fees.amt))) AS Balance
    FROM
        `fees`
    INNER JOIN student ON fees.stu_id = student.id
    GROUP BY student.stu_id

This is the result i'm getting

如果我在两年内添加数据，将会出现问题。

I want to get table like this (orders by month years)

我已经研究了好几个星期，但是我找不到任何解决方案。我感谢您能为此提供帮助。

Answer 1

这个答案可能为时已晚，但是我建议使用第三张表feedsTotals来设置每年的feed总数。像这样：

create table feesTotals (
  id INT NOT NULL AUTO_INCREMENT,
  year INT,
  total DECIMAL(13,2),
  PRIMARY KEY (id)
);

INSERT INTO feesTotals(year,total) 
VALUES (2018, 28000.00) , (2019, 29000.00);

比您可以像这样进行查询：

SELECT
        student.stu_name,
        feesTotals.year,
        SUM(IF(MONTH(fees.date) = 1, fees.amt, 0)) AS Jan,
        SUM(IF(MONTH(fees.date) = 2, fees.amt, 0)) AS Feb,
        SUM(IF(MONTH(fees.date) = 3, fees.amt, 0)) AS Mar,
        SUM(IF(MONTH(fees.date) = 4, fees.amt, 0)) AS Apr,
        SUM(IF(MONTH(fees.date) = 5, fees.amt, 0)) AS May,
        SUM(IF(MONTH(fees.date) = 6, fees.amt, 0)) AS Jun,
        SUM(IF(MONTH(fees.date) = 7, fees.amt, 0)) AS Jul,
        SUM(IF(MONTH(fees.date) = 8, fees.amt, 0)) AS Aug,
        SUM(IF(MONTH(fees.date) = 9, fees.amt, 0)) AS Sep,
        SUM(IF(MONTH(fees.date) = 10, fees.amt, 0)) AS Oct,
        SUM(IF(MONTH(fees.date) = 11, fees.amt, 0)) AS Nov,
        SUM(IF(MONTH(fees.date) = 12, fees.amt, 0)) AS Dece,
        feesTotals.total AS Total,
        (feesTotals.total-(SUM(IFNULL(fees.amt,0)))) AS Balance
FROM student CROSS JOIN feesTotals 
LEFT JOIN fees ON fees.stu_id = student.id AND YEAR(fees.date) = feesTotals.year
GROUP BY student.stu_name, feesTotals.year, feesTotals.total

请参阅DB Fiddle here上的示例

MySQL数据透视表转换为年份月份

1 个答案: