MONGODB显示漂亮,关系查询,逻辑运算

db.school.find({"name":"xudong"}).pretty();spa {"$gt":},{"$gte":""},$lt,db db.school.find({"age":{"$gt":19}}); co {"$and":""} $eq db.school.find({"age":{"$gt":19，“$lt":22}}); db.school.find({"$or":,[{

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