diff --git a/backend/db/implementation/SqlGroupDAO.py b/backend/db/implementation/SqlGroupDAO.py
index cacd9716..1e940df6 100644
--- a/backend/db/implementation/SqlGroupDAO.py
+++ b/backend/db/implementation/SqlGroupDAO.py
@@ -12,7 +12,7 @@ def create_group(self, group: GroupDataclass, project_id: int):
             raise ItemNotFoundError(f"Het project met id {project_id} kon niet in de databank gevonden worden")
         new_group: Group = Group()
         new_group.project_id = project_id
-
+        new_group.project = project
         db.session.add(new_group)
         db.session.commit()
 
diff --git a/backend/db/implementation/SqlSubmissionDAO.py b/backend/db/implementation/SqlSubmissionDAO.py
new file mode 100644
index 00000000..36d4426b
--- /dev/null
+++ b/backend/db/implementation/SqlSubmissionDAO.py
@@ -0,0 +1,48 @@
+from typing import List
+
+from db.errors.database_errors import ItemNotFoundError, UniqueConstraintError
+from db.extensions import db
+from db.interface.SubmissionDAO import SubmissionDAO
+from db.models.models import Student, Subject, Teacher, Project, Group, Submission
+from domain.models.models import SubjectDataclass, SubmissionDataclass
+
+
+class SqlSubmissionDAO(SubmissionDAO):
+    def create_submission(self, submission: SubmissionDataclass, student_id: int, group_id: int):
+        student = Student.query.get(student_id)
+        group = Group.query.get(group_id)
+        if not student:
+            raise ItemNotFoundError(f"student met id {student_id} kon niet in de databank gevonden worden")
+        if not group:
+            raise ItemNotFoundError(f"group met id {group_id} kon niet in de databank gevonden worden")
+        new_submission: Submission = Submission()
+        new_submission.group_id = group_id
+        new_submission.group = group
+        new_submission.student_id = student_id
+        new_submission.student = student
+        new_submission.date_time = submission.date_time
+        new_submission.state = submission.state
+        new_submission.message = submission.message
+
+        db.session.add(new_submission)
+        db.session.commit()
+
+    def get_submission(self, submission_id: int) -> SubmissionDataclass:
+        submission = Submission.query.get(submission_id)
+        if not submission:
+            raise ItemNotFoundError(f"submission met id {submission_id} kon niet in de databank gevonden worden")
+        return submission
+
+    def get_submissions_student(self, student_id: int) -> list[SubmissionDataclass]:
+        student = Student.query.get(student_id)
+        if not student:
+            raise ItemNotFoundError(f"student met id {student_id} kon niet in de databank gevonden worden")
+        submissions: list[SubmissionDataclass] = student.submissions
+        return submissions
+
+    def get_submissions_group(self, group_id: int) -> list[SubmissionDataclass]:
+        group = Group.query.get(group_id)
+        if not group:
+            raise ItemNotFoundError(f"group met id {group_id} kon niet in de databank gevonden worden")
+        submissions: list[SubmissionDataclass] = group.submissions
+        return submissions
diff --git a/backend/db/interface/SubmissionDAO.py b/backend/db/interface/SubmissionDAO.py
index f6496598..a120a72b 100644
--- a/backend/db/interface/SubmissionDAO.py
+++ b/backend/db/interface/SubmissionDAO.py
@@ -5,15 +5,15 @@
 
 class SubmissionDAO(ABC):
     @abstractmethod
-    def create_submission(self, submission: SubmissionDataclass, project_id: int, group_id: int):
+    def create_submission(self, submission: SubmissionDataclass, student_id: int, group_id: int):
         """
-        Creëert een nieuw SubmissionDataClass in de database en associeert het met een ProjectDataClass en een
+        Creëert een nieuw SubmissionDataClass in de database en associeert het met een StudentDataclass en een
         GroupDataClass.
 
         :param submission: De SubmissionDataClass domeinmodel-instantie die aan de database moet worden toegevoegd.
-        :param project_id: De identificatie van de ProjectDataClass waarmee het SubmissionDataClass geassocieerd wordt.
+        :param student_id: De identificatie van de StudentDataclass waarmee het SubmissionDataClass geassocieerd wordt.
         :param group_id: De identificatie van de GroupDataClass waarmee het SubmissionDataClass geassocieerd wordt
-        :raises: ItemNotFoundException: Als er geen ProjectDataClass of GroupDataClass met de opgegeven `project_id` of
+        :raises: ItemNotFoundException: Als er geen StudentDataclass of GroupDataClass met de opgegeven `student_id` of
         `group_id` in de database is.
         """
         raise NotImplementedError()