Difference between revisions of "Sort"
From NoSQLZoo
| Line 25: | Line 25: | ||
<div class=q data-lang="py3">Sort all the documents in world by population descending, then name ascending. | <div class=q data-lang="py3">Sort all the documents in world by population descending, then name ascending. | ||
<pre class=def> | <pre class=def> | ||
| − | + | pp.pprint(list( | |
| − | + | db.world.find().sort({"population":-1,"name":1})) | |
| + | )) | ||
</pre> | </pre> | ||
</div> | </div> | ||
Revision as of 13:38, 27 July 2015
#ENCODING
import io
import sys
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-16')
#MONGO
from pymongo import MongoClient
client = MongoClient()
client.progzoo.authenticate('scott','tiger')
db = client['progzoo']
#PRETTY
import pprint
pp = pprint.PrettyPrinter(indent=4)
#CODE
from bson.code import Code
sort() is a cursor method that orders the results of a query.
The aggregation framework provides the $sort operator, and map_reduce takes sort as a parameter that is applied to the input documents.
The syntax for sort() is sort(<field>:<value>) where 1 indicates ascending and -1 indicates descending.
The order in which fields are specified dictates which fields are sorted first.
Sort all the documents in world by population descending, then name ascending.
pp.pprint(list(
db.world.find().sort({"population":-1,"name":1}))
))