python ruby-programming-language Smalltalk Vue.js Knockoutjs TypeScript JavaScript, OOPs JavaScript Angular 8,7,6,5,4 and 2 Interview Questions and Answers Angular 8,7,6,5,4 and 2 Interview Questions and Answers Angular 4 Angular 2 AngularJs 1.x NodeJs Perl Programming R Programming RequireJs Rust Programming Backbonejs closure programming language go-programming-language kotlin-programming-language
mongodb advantages and disadvantages

mongodb switch expression

Syntax:

    {$project: {
        columnName: {
            $switch: {
                branches: [
                    {
                        case: <your-expression>,
                        then: <your-expression>
                    }                   
                ],
                default: <optional, your-expression>
            }
        }
    }}

Example

db.customers.aggregate([{
  $project: {
    customer: {
      $switch: {
        branches: [
          {
            case: {$eq: ["$Id", 0]},
            then: "Zero!"
          }
        ],
        default: "do something else!"
      }
    }
  }
}])

For more detail, go to links


ANIL SINGH

Hi there! Welcome to my blog. My name is Anil Singh. I'm a author of this blog. For more detail about me, kindly refer to this link..
My Blogs - http://code-sample.com and http://code-sample.xyz
My Books - Interview Questions and Answers Books- Get Your Book in 15+ Digital Stores Worldwide..

You Might Also Like
www.code-sample.com/. Powered by Blogger.
ASK Questions