SQL Server : creating a top 3 view - having difficulties - sql

Question

This is my first time asking a SQL related question. I am having a difficult time getting this query to work.
Basically, I have a database that has 3 tables Course, Faculty and Adjunct. This query is supposed to create a view named Top3Enrollment that returns FirstName, LastName, TotalStudents, and MaxEnrollment of the 3 faculty members with the largest total enrollment for their courses, along with the highest enrollment among the classes they teach.
When attempting to write the query I get an error with selecting the column FirstName
My query:
CREATE VIEW Top3Enrollment
AS
SELECT TOP 3 PERCENT
FirstName, LastName, SUM(Enrollment), MAX(Enrollment)
FROM
Faculty
JOIN
Course ON Faculty.Faculty_ID = Course.Faculty_ID
ORDER BY
MAX(Enrollment);
The error I get is:
Msg 8120, Level 16, State 1, Procedure Top3Enrollment, Line 3 [Batch Start Line 0]
Column 'Faculty.FirstName' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
My database structures:
CREATE TABLE Faculty
(
Faculty_ID VARCHAR(2),
LastName VARCHAR(20),
FirstName VARCHAR(20),
Department VARCHAR(10),
Campus VARCHAR(10)
);
INSERT INTO Faculty
VALUES ('1', 'Brown', 'Joe', 'Business', 'Kent'),
('2', 'Smith', 'John', 'Economics', 'Kent'),
('3', 'Jones', 'Sally', 'English', 'South'),
('4', 'Black', 'Bill', 'Economics', 'Deerwood'),
('5', 'Green', 'Gene', 'Business', 'South');
CREATE TABLE Course
(
Course_ID CHAR(2),
Ref_Number CHAR(5),
Faculty_ID VARCHAR(2),
Term Char(1),
BegDate SMALLDATETIME,
Enrollment INTEGER,
TotRev FLOAT
);
INSERT INTO Course
VALUES ('1', '12345', 'a', 'A', '2016-01-08 00:00:00', 24, 12345.32 ),
('2', '54321', '3', 'B', '2016-02-04 00:00:00', 18, 21435.51 ),
('3', '13524', '1', 'B', '2016-02-04 00:00:00', 7, 1256.67 ),
('4', '24653', '1', 'C', '2016-03-04 00:00:00', 29, 54421.11 ),
('5', '98765', '5', 'A', '2016-01-08 00:00:00', 35, 246753.23),
('6', '14862', '2', 'B', '2016-02-04 00:00:00', 14, 9876.87),
('7', '96032', '1', 'C', '2016-03-04 00:00:00', 8, 863159.31),
('8', '81256', '5', 'A', '2016-01-08 00:00:00', 5, 98762.14),
('9', '64321', '2', 'C', '2016-03-04 00:00:00', 23, 2965.98),
('10','90908', 'a', 'A', '2016-01-08 00:00:00', 45, 91724.02),
('11','90908', '3', 'A', '2016-01-08 00:00:00', 23, 73725.77),
('12','90908', '3', 'A', '2016-01-08 00:00:00', 16, 84224.29),
('13','90908', 'b', 'A', '2016-01-08 00:00:00', 13, 42719.82);
CREATE TABLE Adjuncts
(
Faculty_ID Char(2),
LastName VARCHAR(20),
FirstName VARCHAR(20),
Department VARCHAR(10),
Campus VARCHAR(10)
);
INSERT INTO Adjuncts
VALUES ('a', 'Rogers', 'Aaron', 'Business', 'Kent'),
('b', 'Manning', 'Peyton', 'Economics', 'North'),
('c', 'Drew', 'Maurice', 'English', 'Cecil'),
('d', 'Griffin', 'Robert', 'Music', 'Deerwood'),
('e', 'Goodell', 'Roger', 'Economics', 'South'),
('f', 'Vilma', 'Jonathan', 'Business', 'Kent');
Note:
I Understand I cannot have Order By but I wouldn't know what else to use
Added the database code

Answer 1

When you use aggregate functions like sum and max together with other columns you need to group your aggregations by those other columns.
Add GROUP BY like this
SELECT TOP 3 PERCENT FirstName, LastName, SUM(Enrollment), MAX(Enrollment)
FROM Faculty
JOIN Course ON Faculty.Faculty_ID = Course.Faculty_ID
GROUP BY FirstName, LastName
ORDER BY MAX(Enrollment);