一个从MongoDB数据库中的集合中获取月份计数的PHP程序

Question

In mongodb I am trying to fetch the count of month from a collection which holds the field in the format of ISO Date..

ISODate("2015-05-18T03:56:07.030Z")

retrived the date format as

2015-Jun-17 06:59:33

From that , how do i get the count of month from (January to december from ISO Date) from the collection using mongodb query..

I just need count of month from a collection.

colud some one suggest some ideas for this issue

Answer 1

As I understand you want to get month count without duplications, so you can use $group of aggregation framework .

For examle if in your collection name of ISODate field is date , the query can be something like this:

db.COLLECTION_NAME.aggregate(
   [
      {
        $group : {
           _id : { month: { $month: "$date" } },
           monthCount: { $sum: 1 }
        }
      }
   ]
)