MongoDB 中的子查询用于检索课程详细信息

Question

我有两个文档：

db.COURSE.insertMany([
                {"Course_name" : "Intro to Computer Science",
                "Course_number": "CS1310",
                "Credit_hours" :  4,
                "Department"   : "CS"
                },
                {"Course_name" : "Data Structures",
                "Course_number": "CS3320",
                "Credit_hours" :  4,
                "Department"   : "CS"
                },
                {"Course_name" : "Discrete Mathematics",
                "Course_number": "MATH2410",
                "Credit_hours" :  3,
                "Department"   : "MATH"
                },
                {"Course_name" : "Database",
                "Course_number": "CS3380",
                "Credit_hours" :  3,
                "Department"   : "CS"
                }
])

db.PREREQUISITE.insertMany([
                            {
                            "Course_number":"CS3380",
                            "Prerequisite_number":["CS3320","MATH2410"]
                            },
                            {
                            "Course_number":"CS3320",
                            "Prerequisite_number":"CS1310"
                            }
])

我想查询以检索“数据库”先决条件的 course_name 课程。

我们如何在 Mongo DB 中使用子查询？