You have heard about a new and revolutionary database technology but you don’t know any more about it? Are you wishing to learn about the philosophy of MongoDB or to get the most out of it? Perhaps, are you thinking about what MongoDB can do for you and your company? […]
When we shard a collection MongoDB distributes its data across all the shards of the cluster. MongoDB uses chunks, split and round balancing for getting it. For all of you who want to read about it here it is our last post MongoDB Pre-splitting. This is how MongoDB allows our […]
On April 22th, 2016 I will be at the Engineers School of the University of Huelva making a workshop about MongoDB.
On Friday, December 4th 2015, I’ll be talking about MongoDB at the University of León, Spain.
This is the forth and last post of the serie about the MongoDB Aggregation Framework. We will continue with different queries. By the moment, we are going to use our five documents set inserted in our ‘aggfwktest’ collection. Average computation in a new field
|
1 2 3 4 5 6 7 |
> db.aggfwktest.aggregate([ ... { $group : { _id : "$user_id", mediascore : { $avg : "$score" } } } ... ]) { "_id" : 3, "mediascore" : 7 } { "_id" : 2, "mediascore" : 6 } { "_id" : 1, "mediascore" : 7.5 } > |
The highest and the lowest, […]
Part III of the post MongoDB Aggregation Framework Examples After a brief and theoretical introduction to the Aggregation Framework philosophy, and its odds, we are going to begin with what is really important for us, the examples. Single purpose aggregation operations Count y Distinct are the operations we are most […]
Part II of the post MongoDB Aggregation Framework MongoDB vs SQL As I know that most of you come from SQL world, I am going to show the equivalence between the sql functions and the functions we will use with the aggregation framework. MongoDB Aggregation Operators SQL Functions $project SELECT […]
These are the slides about MongoDB I made for my talk at Betabeers Salamanca last September 30th. http://www.slideshare.net/juanroycouto/mongodb-concepts-39710670 Hope you like!!!
Hello everybody. I would like to tell you that next September 30th, at 19:00 h., there will be a new Betabeers Salamanca edition!!! For this ocasion we will meet us at the Local Hero pub, on the street: Crespo Rascón, 11. Salamanca. I am grateful to Charrosfera for inviting me […]
