Cookies help us deliver our services. By using our services, you agree to our use of cookies. More information

Sort

From NoSQLZoo
Revision as of 15:22, 3 December 2015 by Andr3w (talk | contribs)
Jump to: navigation, search

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.

Python does not store key order for dicts, so instead of the mongo shell {<field1>:<value>,<field2>:<value>} use [(<field1>,<value>), (<field2>,<value>)]

Sort all the documents in world by continent descending, then name ascending. Show only name and continent.
db.world.find({},{name:1,continent:1,_id:0}).sort([("continent",-1),("name",1)])