Use the Northwind database. Choose the best answer from those given below. Sometimes a database may…

Use the Northwind database. Choose the best answer from those
given below.
Sometimes a database may have a separate table to log certain
activities taking place in the database.

Create a new table named ChangeLog in the Northwind database as
follows:

ChangeID
intidentity(1,1)primary
key

EmpIDint(will
contain the ID of the employee being changed)

Usernvarchar(30)(will
contain the login of the user making the change)

Datesmalldatetime(will
contain the date of the change)

OldRatemoney(will
contain the old payrate of the employee)

NewRatemoney(will
contain the new payrate of the employee)

You also need to Alter the Employees table and add a PayRate Column
and set a pay rate for the employees.

CREATE TRIGGER payrate_change ON Employees FOR UPDATE

As

If UPDATE (PayRate) …

After creating the ChangeLog table, create a trigger on the
Employees table for UPDATE. Use this trigger to monitor the PayRate
column, and if the PayRate of an employee gets changed, have the
trigger insert a row into the ChangeLog table with the appropriate
data. [Use the function suser_sname() to get the user making the
change and insert this into the user column.]

Why is the given solution wrong:

CREATE TRIGGER payrate_change ON [dbo].[Employees]

FOR UPDATE

As

declare @empid int

declare @user nvarchar(50)

declare @date smalldatetime

declare @oldRate money

declare @newRate money

select @empid = e.EmployeeID from [dbo].[Employees] as e;

select @oldRate = e.PayRate from [dbo].[Employees] as e;

If UPDATE(PayRate)

BEGIN

set @user = SUSER_SNAME();

set @date = GETDATE();

select @newRate = e.PayRate from [dbo].[Employees] as e;

insert into
[dbo].[ChangeLog](EmpID,[User],[Date],OldRate,NewRate)

values (@empid, @user, @date, @oldRate, @newRate)

END
Based upon the trigger problem from above, pick the
correct solution(s) below. (Can be several)
A –
CREATE TRIGGER payrate_change ON Employees FOR UPDATE

AS

DECLARE @EmpID int;

DECLARE @User nvarchar(30);

DECLARE @Date smalldatetime;

DECLARE @OldRate money;

DECLARE @NewRate money;

IF UPDATE (PayRate)

BEGIN

SELECT @OldRate = (SELECT PayRate FROM DELETED);

SELECT @NewRate = (SELECT Payrate FROM INSERTED);

SELECT @EmpID = (SELECT EmployeeID FROM INSERTED);

SELECT @User = suser_sname();

SELECT @Date = getdate();

INSERT INTO ChangeLog(EmpID, [User], [Date], OldRate,
NewRate)

VALUES (@EmpID, @User, @Date, @OldRate, @NewRate);

END
B –
create Trigger payrate_change ON Employees FOR UPDATE

As

Declare @EmplID int

Declare @user nvarchar(30)

Declare @date smalldatetime

Declare @OldRate money

Declare @NewRate money

Select @EmplID=Employees.employeeID from employees

Select @user = suser_sname()

Select @date = getdate()

Select @oldrate = payrate from deleted

Select @newrate = payrate from inserted

If UPDATE (PayRate)

Insert into ChangeLog

( EmplID , [User] , [Date] , OldRate , NewRate )

Values ( @EmplID, @user, @date, @OldRate, @NewRate)
C –
CREATE Trigger payrate_change

ON Employees FOR UPDATE

As

DECLARE @OldRate money

DECLARE @NewRate money

DECLARE @EmpID int

If UPDATE (PayRate)

BEGIN

SELECT @OldRate – (SELECT PayRate FROM Deleted)

SELECT @NewRate – (SELECT PayRate FROM Inserted)

SELECT @EmpID – (SELECT EmployeeID FROM Inserted)

INSERT INTO ChangeLog (EmpID, User, OldRAte, NewRate)

VALUES (@EmpID, suser_sname(), @OldRate, @NewRate)

END;

ELSE

BEGIN

PRINT ‘Commands executed successfully’

END
D –
CREATE TRIGGER payrate_change ON Employees FOR UPDATE

AS

DECLARE @OldRate money

DECLARE @NewRate money

DECLARE @EmpID = int

IF UPDATE (PayRate)

BEGIN

SELECT @OldRate = (SELECT PayRate FROM Deleted)

SELECT @NewRate = (SELECT PayRate FROM Inserted)

SELECT @EmpID = (SELECT EmployeeID FROM Employees WHERE EmpID =
Deleted.EmpID )

INSERT INTO ChangeLog (EmpID, [User], [Date], NewRate,
OldRate)

VALUES (@EmpID, suser_sname(), getdate(), @OldRate, @NewRate)

END;

ELSE

BEGIN

PRINT ‘Commands executed successfully’

END;
E –
CREATE TRIGGER payrate_change ON Employees FOR UPDATE

AS

DECLARE @OldRate money

DECLARE @NewRate money

DECLARE @EmpID int

IF UPDATE (PayRate)

BEGIN

SELECT @OldRate = (SELECT PayRate FROM Deleted)

SELECT @NewRate = (SELECT PayRate FROM Inserted)

SELECT @EmpID = (SELECT EmployeeID FROM Employees WHERE 1
=1)

INSERT INTO ChangeLog (EmpID, [User], [Date], NewRate,
OldRate)

VALUES (@EmpID, suser_sname(), getdate(), @OldRate, @NewRate)

END;

ELSE

BEGIN

PRINT ‘Commands executed successfully’

END;

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