Shulou(Shulou.com)06/01 Report--

1. View Collections

show collections

2. Add multiple data

db.runoob.insertMany([

{

'title':'MongoDB Overview',

'description':'MongoDB is no sql database',

'by_user':'demo.runoob.com',

'url':'http://www.runoob.com',

'tags':['mongodb', 'database', 'NoSQL'],

'likes':100

},

{

'title':'NoSQL Overview',

'description':'No sql database is very fast',

'by_user':'demo.runoob.com',

'url':'http://www.runoob.com',

'tags':['mongodb', 'database', 'NoSQL'],

'likes':10

},

{

'title':'MongoDB Overview1',

'description':'MongoDB is no sql database',

'by_user':'study.runoob.com',

'url':'http://www.runoob.com',

'tags':['mongodb', 'database', 'NoSQL'],

'likes':100

},

{

'title':'NoSQL Overview1',

'description':'No sql database is very fast',

'by_user':'study.runoob.com',

'url':'http://www.runoob.com',

'tags':['mongodb', 'database', 'NoSQL'],

'likes':10

}

])

3. view all data

db.runoob.find().pretty()

4. Group query

db.runoob.aggregate([{$group : {_id : "$by_user", num_tutorial : {$sum : 1}}}])

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