Question

I’m trying the following :

CREATE TRIGGER checkgrade ON 
[Homework4part3].[dbo].[Enrollment]
FOR INSERT
AS
    IF (NEW.grade > 20)
    BEGIN
    grade = 3
    END

GO

and my table looks like :

Enrollment(course#, QYear, SUID,
units, Grade)

dont know why this error showing :

Msg 102, Level 15, State 1, Procedure checkgrade, Line 7
Incorrect syntax near 'grade'.

Answer 1

There are a few problems.

You need to use the Inserted meta table which covers the newly updated/inserted rows.
You need to perform a proper update as the trigger executes after the update/insert, not in the middle of it.

This might be closer to what’s required:

 CREATE TRIGGER checkgrade ON 
    [Homework4part3].[dbo].[Enrollment]
    FOR INSERT
    AS
    BEGIN
        SET NOCOUNT ON

        Update e
        set grade = 3
        from 
            [Homework4part3].[dbo].[Enrollment] e
            join Inserted i on e.SUID = i.SUID and e.[course#] = i.[course#]
        where i.grade > 20

    END

Note: this is untested, and I’ve guessed as to the primary key columns on your table.