This site uses cookies for analytics, personalized content. By continuing to browse this site, you agree to this use. Learn More

Skip to main content
Microsoft
Cosmosdb
Cosmosdb
  • Home
  • DevBlogs
    • Azure DevOps
    • Notification Hubs
    • Visual Studio
    • Visual Studio Code
    • Visual Studio for Mac
    • Azure Artifacts
    • Azure Boards
    • Azure Pipelines
    • Azure Repos
    • Azure Test Plans
    • DevOps
    • C++
    • Java
    • Java Blog in Chinese
    • JavaScript
    • PowerShell Community
    • PowerShell Team
    • Python
    • Q#
    • TypeScript
    • Visual Basic
    • Visual C#
    • Visual F#
    • .NET
    • ASP.NET
    • NuGet
    • Xamarin
    • #ifdef Windows
    • Apps for Windows
    • Azure Depth Platform
    • Azure Government
    • Azure SDKs
    • Bing Dev Center
    • Command Line
    • CSE Developer
    • Developer Support
    • DirectX Developer Blog
    • IoT Developer
    • Math In Office
    • Microsoft Edge Dev
    • Microsoft Azure
    • Office 365 Development
    • Old New Thing
    • PAX Media
    • Perf and Diagnostics
    • PIX on Windows
    • Startup Developers
    • Surface Duo
    • Sustainable Software
    • Windows Search Platform
    • Azure Cosmos DB
    • Azure Data Studio
    • Azure SQL
    • Azure Synapse Analytics
    • OData
    • Revolutions R
    • SQL Server Data Tools

    Azure Cosmos DB Blog

    The latest news, updates and technical insights from the Azure Cosmos DB team

    query Archives | Azure Cosmos DB Blog

    Understanding the difference between null and undefined in Azure Cosmos DB
    Understanding the difference between null and undefined in Azure Cosmos DB
    AvatarTim SanderNovember 25, 2020Nov 25, 202011/25/20
    This blog is part two of a series of three blogs where we’ll demystify commonly confused concepts for developers learning how to query in the SQL (core) API in Azure Cosmos DB. We’ll look at the difference between null and undefined values.

    3Core (SQL) APITips and Tricks
    Relevant Links

    Labs and Workshops

    Documentation

    Reference Architectures

    Tools

     

    SDKs

    .NET Core

    Java

    Node.js

    Python

     

    Model APIs

    SQL (Core)

    Cassandra

    Gremlin

    MongoDB

    etcd

    Table

     

    Official Product Pages

    Azure Cosmos DB

    Pricing

    Top Bloggers
    Avatar

    Tim Sander
    Program Manager

    Nikisha Reyes-Grange

    Nikisha Reyes-Grange
    Sr. Marketing Manager

    Avatar

    Theo van Kraay
    Program Manager

    Avatar

    Thomas Weiss
    Program Manager

    Luis Bosquez

    Luis Bosquez
    Program Manager

    Avatar

    Matias Quaranta
    Software Engineer

    Andy Feldman

    Andy Feldman
    Program Manager II

    Deborah Chen

    Deborah Chen
    Program Manager

    Mark Brown

    Mark Brown
    Principal Program Manager

    Tonio Lora

    Tonio Lora
    Principal Data Architect

    Topics
  • Announcements
  • Tips and Tricks
  • Core (SQL) API
  • News
  • API for MongoDB
  • Query
  • Cassandra API
  • Analytics
  • Data Architecture
  • Java SDK
  • Change Feed
  • Security
  • Migration
  • Powershell
  • Gremlin API
  • Notebooks
  • AI
  • Python SDK
  • Stay informed

    Login
    Code Block
    What's new
    • Surface Duo
    • Surface Laptop Go
    • Surface Pro X
    • Surface Go 2
    • Surface Book 3
    • Microsoft 365
    • Windows 10 apps
    • HoloLens 2
    Microsoft Store
    • Account profile
    • Download Center
    • Microsoft Store support
    • Returns
    • Order tracking
    • Virtual workshops and training
    • Microsoft Store Promise
    • Financing
    Education
    • Microsoft in education
    • Office for students
    • Office 365 for schools
    • Deals for students & parents
    • Microsoft Azure in education
    Enterprise
    • Azure
    • AppSource
    • Automotive
    • Government
    • Healthcare
    • Manufacturing
    • Financial services
    • Retail
    Developer
    • Microsoft Visual Studio
    • Windows Dev Center
    • Developer Center
    • Microsoft developer program
    • Channel 9
    • Microsoft 365 Dev Center
    • Microsoft 365 Developer Program
    • Microsoft Garage
    Company
    • Careers
    • About Microsoft
    • Company news
    • Privacy at Microsoft
    • Investors
    • Diversity and inclusion
    • Accessibility
    • Security
    English (United States)
    • Sitemap
    • Contact Microsoft
    • Privacy
    • Manage cookies
    • Terms of use
    • Trademarks
    • Safety & eco
    • About our ads
    • © Microsoft 2021