Error: Could not create constraint SQL Server 2008 - sql

Question

I am creating 6 tables. When creating the first 3 tables, everything works well. But then when I have to use a Foreign Key that I have used previously when creating another table, the system presents an error.
These are the 3 first tables:
CREATE TABLE Employee (
EmployeeID INTEGER PRIMARY KEY NOT NULL,
Name TEXT NOT NULL,
Position TEXT NOT NULL,
Salary REAL NOT NULL,
Remarks TEXT
);
CREATE TABLE Planet (
PlanetID INTEGER PRIMARY KEY NOT NULL,
Name TEXT NOT NULL,
Coordinates REAL NOT NULL
);
CREATE TABLE Has_Clearance (
Employee INTEGER NOT NULL
CONSTRAINT fk_Employee_EmployeeID REFERENCES Employee(EmployeeID),
Planet INTEGER NOT NULL
CONSTRAINT fk_Planet_PlanetID REFERENCES Planet(PlanetID),
Level INTEGER NOT NULL,
PRIMARY KEY(Employee, Planet)
);
Then I create the 4th table:
CREATE TABLE Shipment (
ShipmentID INTEGER PRIMARY KEY NOT NULL,
Date TEXT,
Manager INTEGER NOT NULL
CONSTRAINT fk_Employee_EmployeeID REFERENCES Employee(EmployeeID),
Planet INTEGER NOT NULL
CONSTRAINT fk_Planet_PlanetID REFERENCES Planet(PlanetID)
);
And I get the following error:
"There is already an object named 'fk_Employee_EmployeeID' in the database. Could not create constraint."
Please let me know how to create the FK in this 4th table.

Answer 1

The constraint "fk_Employee_EmployeeID" is first created on table "Has_Clearance" and then you try to create another constraint with the same name - which is not allowed.
Just rename the constraint in the 4-th table like this:
CREATE TABLE Shipment (
ShipmentID INTEGER PRIMARY KEY NOT NULL,
Date TEXT,
Manager INTEGER NOT NULL CONSTRAINT fk_Maneger_EmployeeID REFERENCES Employee(EmployeeID),
Planet INTEGER NOT NULL CONSTRAINT fk_Planet_PlanetID REFERENCES Planet(PlanetID)
);