Created
May 4, 2011 18:30
-
-
Save gatesvp/955721 to your computer and use it in GitHub Desktop.
Test for nulls in MongoDB
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| > db.foo.insert( { x : 1, y : 1 } ) | |
| > db.foo.insert( { x : 2, y : "string" } ) | |
| > db.foo.insert( { x : 3, y : null } ) | |
| > db.foo.insert( { x : 4 } ) | |
| > db.foo.find() | |
| { "_id" : ObjectId("4dc1974612c677fc83b5629d"), "x" : 1, "y" : 1 } | |
| { "_id" : ObjectId("4dc1974c12c677fc83b5629e"), "x" : 2, "y" : "string" } | |
| { "_id" : ObjectId("4dc1975312c677fc83b5629f"), "x" : 3, "y" : null } | |
| { "_id" : ObjectId("4dc1975a12c677fc83b562a0"), "x" : 4 } | |
| > db.foo.find( { "y" : null } ) | |
| { "_id" : ObjectId("4dc1975312c677fc83b5629f"), "x" : 3, "y" : null } | |
| { "_id" : ObjectId("4dc1975a12c677fc83b562a0"), "x" : 4 } | |
| > db.foo.find( { "y" : { $type : 10 } } ) | |
| { "_id" : ObjectId("4dc1975312c677fc83b5629f"), "x" : 3, "y" : null } | |
| > db.foo.find( { "y" : { $exists : false } } ) | |
| { "_id" : ObjectId("4dc1975a12c677fc83b562a0"), "x" : 4 } | |
| > |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment