Question

我需要根据培训课程的时间长短给客户打折。要找出通过日期，必须首先知道客户所属的组ID。

当我知道小组的ID时，我可以在开始培训课程时找到日期。

然后，按照查找日期确定折扣的大小这是一个在MS SQL中运行良好的脚本，但在MySql中它不起作用。

CREATE DEFINER=`root`@`localhost` PROCEDURE `GetBonus`(
idStudent CHAR(36)
)
BEGIN   
    IF (SELECT COUNT(*) FROM (SELECT IdGroupe FROM GroupeStudent WHERE IdStudent = idStudent) groupeCourse) = 1 THEN 
    BEGIN
    DECLARE CourseGroupeDate datetime;
    SET CourseGroupeDate = (SELECT Date FROM CourseGroupe WHERE Id = (SELECT IdGroupe FROM GroupeStudent WHERE IdStudent = idStudent));
        IF (CourseGroupeDate - INTERVAL NOW() MONTH)  < 3 AND  
            (CourseGroupeDate - INTERVAL NOW() MONTH) > 0
            THEN SELECT * FROM Discounts WHERE Id = '00000000-0000-0000-0000-000000000000';
        ELSEIF (CourseGroupeDate - INTERVAL NOW() MONTH) < 6 AND  
            (CourseGroupeDate - INTERVAL NOW() MONTH) > 3
            THEN SELECT * FROM Discounts WHERE Id = '00000000-0000-0000-0000-000000000001';
        ELSEIF (CourseGroupeDate - INTERVAL NOW() MONTH) < 12 AND  
            (CourseGroupeDate - INTERVAL NOW() MONTH) > 6 
            THEN SELECT * FROM Discounts WHERE Id = '00000000-0000-0000-0000-000000000002';
        END IF;
    END;
    END IF;
END

Answer 1

CREATE PROCEDURE `GetBonus`(
idStudent CHAR(36)
)
BEGIN   
    IF (SELECT COUNT(groupeCourse.IdGroupe) FROM (SELECT IdGroupe FROM GroupeStudent WHERE GroupeStudent.IdStudent = idStudent) groupeCourse) = 1 THEN 
    BEGIN
    SET @CourseGroupeDate := (SELECT Date FROM CourseGroupe WHERE Id = (SELECT GroupeStudent.IdGroupe FROM GroupeStudent WHERE GroupeStudent.IdStudent = idStudent));
        IF (TIMESTAMPDIFF(MONTH, @CourseGroupeDate, now()))  < 3 AND  
            (TIMESTAMPDIFF(MONTH, @CourseGroupeDate, now())) > 0
            THEN SELECT * FROM Discounts WHERE Id = '00000000-0000-0000-0000-000000000000';
        ELSEIF (TIMESTAMPDIFF(MONTH, @CourseGroupeDate, now())) < 6 AND  
            (TIMESTAMPDIFF(MONTH, @CourseGroupeDate, now())) > 3
            THEN SELECT * FROM Discounts WHERE Id = '00000000-0000-0000-0000-000000000001';
        ELSEIF (TIMESTAMPDIFF(MONTH, @CourseGroupeDate, now())) < 12 AND  
            (TIMESTAMPDIFF(MONTH, @CourseGroupeDate, now())) > 6 
            THEN SELECT * FROM Discounts WHERE Id = '00000000-0000-0000-0000-000000000002';
        END IF;
    END;
    END IF;
END

所有细节，例如，有必要指定关于字段的表名称 GroupeStudent.IdStudent = idStudent

它不适用于条件

1 个答案: