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query:Db.collection.find ({"userid": {"$gte": "494"}})SQL query:SELECT * FROM collection where UserID >= 494;Query Operator "$LT"-less thanMongoDB query:Db.collection.find ({"userid": {"$lt": "494"}})SQL query:SELECT * FROM collection where UserID Query Operator "$lte"-less than or equal toMongoDB query:Db.collection.find ({"userid": {"$lte": "494"}})SQL query:SELECT * FROM collection where UserID The quer

I do the project only data query, MongoDB database is other companies to store data and maintenance.The pit daddy is the data I need is in the deep level of a record in MongoDB.I need to take the nth value of BV in the BMV record of VL, according to the parameters. A lot of data, if taken out, the subsequent data processing will greatly affect the efficiency.MongoDB statement:Find ({"BSN": "95614", "BMV. Vl. BV ": {" $exists ": true}," ct ": {" $gte ": 1419868800," $

": ObjectId ("5437383157ABAFE09D99CBFC"), "name": "Jack", "Age":} {"_id": ObjectId ("543738B857ABAFE09D99CBFD"), "name": "Jack", "Age":}>3. Query conditions"$lt", "$lte", "$gt", "$gte" correspond to The following code:Db. Student.find ({age:{$gt: 33}}) query for age greater than 33Db. Student.find ({age:{$gte: 33}})Db. Student.find ({age:{$lt: 33}})Db. Student.find ({age:{$lte: 33}})Db. Student.find ({age:{

Tags: tags sed test data gray process localhost SSE localOne, the connection 1.mongo mongodb://localhost:27000 2. Show Databases (DBS) Use test 3. Db Show collections Second, insert 1.db.proccessedfile.insertone ({fileName: "20170403/3.gz", Processeddate:new isodate (), datanumber:10000, x:10}) 2.db.mongodb.insertmany ([{item: "Journal", Qty:25, Tags: ["blank", "red"], size: {h:14, w:21, UoM: "CM"}}, { Item: "Mat", qty:85, Tags: ["Gray"], size: {h:27.9, w:35.5, UoM: "CM"}}, {item: "Mousepad", qt

. Student.find ({Name: "Jack"},{sex:0}){"_id": ObjectId ("5437383157ABAFE09D99CBFC"), "name": "Jack", "Age":}{"_id": ObjectId ("543738B857ABAFE09D99CBFD"), "name": "Jack", "Age":}>3. Query conditions"$lt", "$lte", "$gt", "$gte" correspond to The following code:Db. Student.find ({age:{$gt: 33}}) query for age greater than 33Db. Student.find ({age:{$gte: 33}})Db. Student.find ({age:{$lt: 33}})Db. Student.find ({age:{$

": ObjectId ("5437383157ABAFE09D99CBFC"), "name": "Jack", "Age":} {"_id": ObjectId ("543738B857ABAFE09D99CBFD"), "name": "Jack", "Age":}>3. Query conditions"$lt", "$lte", "$gt", "$gte" correspond to The following code:Db. Student.find ({age:{$gt: 33}}) query for age greater than 33Db. Student.find ({age:{$gte: 33}})Db. Student.find ({age:{$lt: 33}})Db. Student.find ({age:{$lte: 33}})Db. Student.find ({age:{

Tags: nstat creat iterative OTA database data upd LTE Zhang criteria After the successful start of MongoDB, and then open a command line window input MONGO, you can do some of the database operations. Enter help to see the basic Operations Command: Show DBS: Display Database listShow Collections: Displays a collection in the current database (similar to a table in a relational database)Show Users: Show user Use Db.help (): Show database Operations Com

recordDb.employee.find ({"Sex": "Male"}). Pretty ();Example 5: Querying for records older than 19 yearsDb.employee.find ({"Age": {"$GT":}}). Pretty ();Example 6: Querying for records with age less than or equal to 19 yearsDb.employee.find ({"Age": {"$lte":}}). Pretty ();Example 7: Query gender is not a woman's recordDb.employee.find ({"Sex": {"$ne": "Female"}}). Pretty ();Logical operationsand $andor $orNon-$not $norExample 8: Querying a record of ag