Question

Is this possible to make a query like that in MongoDB?

SELECT  `pro` , COUNT( * ) , SUM( `age` ) 
FROM  `k_pin` 
GROUP BY  `pro

If yes, how? PHP example would be perfect.

Answer 1

The mongoDB call would be as follows:

db.k_pin.aggregate([ 
 { $group: {_id:"$pro", count:{$sum:1}, sum_age:{$sum:"$age"}} }
])

Which can all be found here: http://www.mongodb.org/display/DOCS/SQL+to+Aggregation+Framework+Mapping+Chart

I will leave the php up to you, since that is the easy part.