学生は月額を支払う学校に通っています。その値は(FatherSalary + MotherSalary)*0.05
昨日トリガーの勉強を始めたばかりです。トリガーを作成しましたが、エラーが発生しました。
メッセージ515、レベル16、状態2、プロシージャTR_Calc_Value、25行
目列'IDStudent'、テーブル'HW32.dbo.Enrollment'に値NULLを挿入できません。列はnullを許可しません。INSERTは失敗します。
テーブルに値を挿入するとEnrollment
。これを解決する方法はありますか?
USE master;
IF DB_ID (N'HW32') IS NOT NULL
DROP DATABASE HW32;
CREATE DATABASE HW32;
USE HW32
CREATE TABLE Family(
IDFamily int IDENTITY(1,1),
FirstName nchar(20) NOT NULL,
LastName nchar(20) NOT NULL,
Gender nchar(1) NOT NULL,
Salary money,
CONSTRAINT PK_Family PRIMARY KEY(IDFamily),
CONSTRAINT CK_Family_Gender CHECK (Gender IN ('M','F'))
)
CREATE TABLE Student(
IDStudent int IDENTITY(1,1),
FirstName nchar(20) NOT NULL,
LastName nchar(20) NOT NULL,
CONSTRAINT PK_Student PRIMARY KEY(IDStudent)
)
CREATE TABLE Filiation(
IDStudent int,
IDFamily int,
Filiation nchar(20) NOT NULL,
CONSTRAINT FK_Filiation_IDStudent FOREIGN KEY (IDStudent)
REFERENCES Student(IDStudent),
CONSTRAINT FK_Filiation_IDFamily FOREIGN KEY (IDFamily)
REFERENCES Family(IDFamily),
CONSTRAINT PK_Filiation PRIMARY KEY(IDStudent,IDFamily)
)
CREATE TABLE Enrollment(
IDEnrollment int IDENTITY(1,1),
IDStudent int NOT NULL,
Status nchar(20) NOT NULL,
MonthlyPayment money,
CONSTRAINT PK_Enrollment PRIMARY KEY(IDStudent),
CONSTRAINT FK_Enrollment_IDStudent FOREIGN KEY (IDStudent)
REFERENCES Student(IDStudent),
CONSTRAINT CK_Enrollment_Status CHECK(Status IN('Acepted','Rejected')),
CONSTRAINT UC_Enrollment UNIQUE (IDEnrollment)
)
USE HW32
GO
CREATE TRIGGER TR_Calc_Value
ON Enrollment
AFTER INSERT, UPDATE AS
DECLARE @monthlyPayment money, @sFather money, @sMother money
BEGIN
SET @sFather = (SELECT FAM.Salary
FROM Family FAM
LEFT JOIN Filiation F ON F.IDFamily = FAM.IDFamily
LEFT JOIN inserted I ON I.IDStudent = F.IDStudent
WHERE F.IDStudent = I.IDStudent AND FAM.Gender = 'M')
SET @sMother = (SELECT FAM.Salary
FROM Family FAM
LEFT JOIN Filiation F ON F.IDFamily = FAM.IDFamily
LEFT JOIN inserted I ON I.IDStudent = F.IDStudent
WHERE F.IDStudent = I.IDStudent AND FAM.Gender = 'F')
SET @monthlyPayment = ((@sFather + @sMother) * 0.05)
INSERT INTO Enrollment (MonthlyPayment) VALUES (@monthlyPayment)
END
GO
USE HW32
INSERT INTO Family VALUES('John', 'Smith', 'M', 800)
INSERT INTO Family VALUES('Anna', 'Smith', 'F', 800)
INSERT INTO Student VALUES('Carl', 'Smith')
INSERT INTO Filiation VALUES(1, 1, 'Father')
INSERT INTO Filiation VALUES(1, 2, 'Mother')
INSERT INTO Enrollment (IDStudent, Status) VALUES(1, 'Accepted')