SQL Server Management Studio：不能绑定多部分标识符

Question

I'm taking a SQL class, and on one of the assignments I am asked to create a table with employees, one with projects, as follows:

create table [EMPLOYEE]
(
    EmployeeID int identity(1, 1) primary key not null,
    FirstName varchar(15) not null,
    LastName varchar(15) not null,
    Gender char(1) not null,
    DOB date not null,
    SSN char(9) not null
)

create table [PROJECT]
(
    ProjectID int identity(1, 1) primary key not null,
    Manager int not null,
    PDescription varchar(50) not null,
    PStatus varchar(20) not null,
    StartDate date not null,
    EndDate date not null
)

Where the Manager is the ID of an EMPLOYEE entity. Basically projects are assigned to employees. So, I add some employees and projects

insert into EMPLOYEE (FirstName, LastName, Gender, DOB, SSN)
values ('Chuck', 'Carter', 'M', '07/14/1990', '444556666')

This is the one employee I'm interested in, and in the inserting I'm doing this is the second one, so its EmployeeID would be 2. As for the projects:

insert into PROJECT (Manager, PDescription, PStatus, StartDate, EndDate)
values (2, 'Submit source code for 3D racing game', 'In progress', '01/05/2015', '03/05/2015')

insert into PROJECT (Manager, PDescription, PStatus, StartDate, EndDate)
values (2, 'Test videogame for bugs', 'Not started', '03/05/2015', '05/05/2015')

These two are the ones assigned to the employee above, notice Manager for both is 2, and the EmployeeID of Chuck is supposed to be 2. So, I'm supposed to display the employee name as a full name, combining the first and last name, of those who have been assigned two or more projects (in this case, Chuck).

I wrote this code:

select 
    FirstName + LastName as FullName 
from 
    EMPLOYEE
where 
    EmployeeID = PROJECT.Manager and count(PROJECT.Manager) >= 2

But instantly I get this error:

The multi-part identifier "PROJECT.Manager" could not be bound.

Am I supposed to make an inner join to recognize the PROJECT table? But I'm only supposed to display the name of the employee. How can I manage to use the PROJECT.manager column values without displaying them?

Thank you very much in advance.

Answer 1

You have to Join Project table, Add Group by with having clause to filter the Manager

select FirstName +' '+ LastName as FullName 
from EMPLOYEE
INNER JOIN PROJECT
on EmployeeID = PROJECT.Manager
group by FirstName +' '+ LastName
Having count(PROJECT.Manager) >= 2