student_manage_system/StatCalc/dao/statcalc_dao.py

from StatCalc.schema.statcalc_request import *
from fastapi import HTTPException

from students.model.students_model import Students

def get_age_30(db):
    q = db.query(Students).filter(Students.age>=30).all()
    return q

from class_management.model.class_management_model import ClassInfo

def get_class_count(db):
    q = (db.query(ClassInfo.id)
         .join(Students,Students.class_id==ClassInfo.id)
         .group_by(ClassInfo.id,Students.sex,)
         .all())
    m
    f
    return q