How to realize range Operation in MongoDB
MongoDB中怎么实现范围运算，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
"$in"：在范围之中
"$nin"：不再范围之中
范例：查询姓名为"赵一"、"王八"的信息
> db.emp.find({"name":{"$in":["赵一","王八"]}}).pretty();
{
"_id" : ObjectId("599108423268c8e84253be26"),
"name" : "赵一",
"sex" : "男",
"age" : 30,
"sal" : 1000,
"loc" : "北京"
}
{
"_id" : ObjectId("599108433268c8e84253be2d"),
"name" : "王八",
"sex" : "男",
"age" : 35,
"sal" : 8000,
"loc" : "北京"
}
范例：查询姓名不是"赵一"、"王八"的信息
> db.emp.find({"name":{"$nin":["赵一","王八"]}}).pretty();
{
"_id" : ObjectId("599108423268c8e84253be27"),
"name" : "钱二",
"sex" : "女",
"age" : 22,
"sal" : 5000,
"loc" : "上海"
}
{
"_id" : ObjectId("599108423268c8e84253be28"),
"name" : "孙三",
"sex" : "男",
"age" : 40,
"sal" : 2000,
"loc" : "深圳"
}
{
"_id" : ObjectId("599108423268c8e84253be29"),
"name" : "李四",
"sex" : "女",
"age" : 30,
"sal" : 7000,
"loc" : "北京"
}
{
"_id" : ObjectId("599108423268c8e84253be2a"),
"name" : "周五",
"sex" : "女",
"age" : 30,
"sal" : 6400,
"loc" : "北京"
}
{
"_id" : ObjectId("599108423268c8e84253be2b"),
"name" : "吴六",
"sex" : "男",
"age" : 30,
"sal" : 2500,
"loc" : "重庆"
}
{
"_id" : ObjectId("599108423268c8e84253be2c"),
"name" : "郑七",
"sex" : "女",
"age" : 50,
"sal" : 4700,
"loc" : "成都"
}
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