是的,我们可以在MongoDB中一起使用NOT和AND。语法如下
NOT X AND NOT Y = NOT (X AND Y) Let us see the working of above syntax. If both X and Y will be true then last result will be false. If one of the operands gives result false then last result will be true.
以下是使用文档创建集合的查询
> db.NotAndDemo.insertOne({"StudentName":"John","StudentCountryName":"US"}); { "acknowledged" : true, "insertedId" : ObjectId("5c98746a330fd0aa0d2fe4a8") } > db.NotAndDemo.insertOne({"StudentName":"John","StudentCountryName":"UK"}); { "acknowledged" : true, "insertedId" : ObjectId("5c987478330fd0aa0d2fe4a9") } > db.NotAndDemo.insertOne({"StudentName":"David","StudentCountryName":"AUS"}); { "acknowledged" : true, "insertedId" : ObjectId("5c987487330fd0aa0d2fe4aa") } > db.NotAndDemo.insertOne({"StudentName":"Chris","StudentCountryName":"UK"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9874ac330fd0aa0d2fe4ab") } > db.NotAndDemo.insertOne({"StudentName":"Chris","StudentCountryName":"US"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9874b7330fd0aa0d2fe4ac") }
以下是在find()
方法的帮助下显示集合中所有文档的查询
> db.NotAndDemo.find().pretty(); This will produce the following output: { "_id" : ObjectId("5c98746a330fd0aa0d2fe4a8"), "StudentName" : "John", "StudentCountryName" : "US" } { "_id" : ObjectId("5c987478330fd0aa0d2fe4a9"), "StudentName" : "John", "StudentCountryName" : "UK" } { "_id" : ObjectId("5c987487330fd0aa0d2fe4aa"), "StudentName" : "David", "StudentCountryName" : "AUS" } { "_id" : ObjectId("5c9874ac330fd0aa0d2fe4ab"), "StudentName" : "Chris", "StudentCountryName" : "UK" } { "_id" : ObjectId("5c9874b7330fd0aa0d2fe4ac"), "StudentName" : "Chris", "StudentCountryName" : "US" }
以下是将NOT和AND一起使用的查询,与NOT(X AND Y)的NOT X或NOT Y相同
> db.NotAndDemo.find({ ... "$or": [ ... {"StudentName": {"$ne": "Chris"}}, ... {"StudentCountryName": {"$ne": "US"}} ... ] ... }).pretty();
这将产生以下输出
{ "_id" : ObjectId("5c98746a330fd0aa0d2fe4a8"), "StudentName" : "John", "StudentCountryName" : "US" } { "_id" : ObjectId("5c987478330fd0aa0d2fe4a9"), "StudentName" : "John", "StudentCountryName" : "UK" } { "_id" : ObjectId("5c987487330fd0aa0d2fe4aa"), "StudentName" : "David", "StudentCountryName" : "AUS" } { "_id" : ObjectId("5c9874ac330fd0aa0d2fe4ab"), "StudentName" : "Chris", "StudentCountryName" : "UK" }