Example Schema

The example schema below contains data for a university enrollment system. Information about students, departments, courses, etc. are organized in multiple tables.

Warning

Empty primary keys, such as in the CurrentTerm table, are not yet supported by DataJoint. This feature will become available in a future release. See Issue #113 for more information.

@schema
class Student (dj.Manual):
  definition = """
  student_id      : int unsigned # university ID
  ---
  first_name      : varchar(40)
  last_name       : varchar(40)
  sex             : enum('F', 'M', 'U')
  date_of_birth   : date
  home_address    : varchar(200) # street address
  home_city       : varchar(30)
  home_state      : char(2) # two-letter abbreviation
  home_zipcode    : char(10)
  home_phone      : varchar(14)
  """

@schema
class Department (dj.Manual):
  definition = """
  dept         : char(6) # abbreviated department name, e.g. BIOL
  ---
  dept_name    : varchar(200) # full department name
  dept_address : varchar(200) # mailing address
  dept_phone   : varchar(14)
  """

@schema
class StudentMajor (dj.Manual):
  definition = """
  -> Student
  ---
  -> Department
  declare_date :  date # when student declared her major
  """

@schema
class Course (dj.Manual):
  definition = """
  -> Department
  course      : int unsigned # course number, e.g. 1010
  ---
  course_name : varchar(200) # e.g. "Cell Biology"
  credits     : decimal(3,1) # number of credits earned by completing the course
  """

@schema
class Term (dj.Manual):
  definition = """
  term_year : year
  term      : enum('Spring', 'Summer', 'Fall')
  """

@schema
class Section (dj.Manual):
  definition = """
  -> Course
  -> Term
  section : char(1)
  ---
  room  :  varchar(12) # building and room code
  """

@schema
class CurrentTerm (dj.Manual):
  definition = """
  ---
  -> Term
  """

@schema
class Enroll (dj.Manual):
  definition = """
  -> Section
  -> Student
  """

@schema
class LetterGrade (dj.Manual):
  definition = """
  grade : char(2)
  ---
  points : decimal(3,2)
  """

@schema
class Grade (dj.Manual):
  definition = """
  -> Enroll
  ---
  -> LetterGrade
  """

Example schema ERD

Example schema for a university database. Tables contain data on students, departments, courses, etc.

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