MongoDB中如何按时间戳（降序）排序
要按时间戳排序，请在MongoDB中使用sort()。让我们创建一个包含文档的集合-
> db.demo737.insertOne({"timestamp" : new ISODate("2020-04-01" )});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead682157bb72a10bcf065c")
}
> db.demo737.insertOne({"timestamp" : new ISODate("2020-10-31" )});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead682757bb72a10bcf065d")
}
> db.demo737.insertOne({"timestamp" : new ISODate("2020-05-02" )});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead682a57bb72a10bcf065e")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo737.find();
这将产生以下输出-
{ "_id" : ObjectId("5ead682157bb72a10bcf065c"), "timestamp" : ISODate("2020-04-01T00:00:00Z") }
{ "_id" : ObjectId("5ead682757bb72a10bcf065d"), "timestamp" : ISODate("2020-10-31T00:00:00Z") }
{ "_id" : ObjectId("5ead682a57bb72a10bcf065e"), "timestamp" : ISODate("2020-05-02T00:00:00Z") }以下是按时间戳排序的查询（降序）-
> db.demo737.find().sort({"timestamp":-1});这将产生以下输出-
{ "_id" : ObjectId("5ead682757bb72a10bcf065d"), "timestamp" : ISODate("2020-10-31T00:00:00Z") }
{ "_id" : ObjectId("5ead682a57bb72a10bcf065e"), "timestamp" : ISODate("2020-05-02T00:00:00Z") }
{ "_id" : ObjectId("5ead682157bb72a10bcf065c"), "timestamp" : ISODate("2020-04-01T00:00:00Z") }