mongodb_documents_query

//employeesDB => employees
use employeesDB
db

show collections

db.employees.find().pretty()
db.employees.findOne()
db.employees.find({"Age" : 30.0})
db.employees.find({"points" : {$lt : 50.0} })
db.employees.find({"points" : {$lte : 50.0} })
db.employees.find({"points" : {$gt : 50.0} })
db.employees.find({"points" : {$gte : 50.0} })
db.employees.find({"points" : {$ne : 50.0} })
db.employees.find({"skills" : {$in : ["C","Java"]}})
db.employees.find({"skills" : {$nin : ["Java"]}})