Create SharePoint Choice Field (Site Column) using PowerShell

Start-SPAssignment -Global

$url = "siteurl"

$web = get-spweb $url

$fieldName = "Surya"

$field = $web.Fields[$fieldName]

 if($field -ne $nul)

 {

      Write-Host $field.Title "Field already avilable in the site"

 }

 else

 {

#There are 2 ways to create a field.

#First Apporach

 <#

      Write-Host "no fields exist with this name. creating..."

      $web.fields.add($fieldName, "Choice", $true)

      $field = $web.fields.getfield($fieldName)

      $field.Group = "Custom Columns"

      $field.Choices.Add("Yes")

      $field.Choices.Add("No")

      $field.Update()

     Write-Host "Field Created"

#>

#Second Apporach

      $suryafield = "<Field Type='Choice' DisplayName='Surya' Required='TRUE' Format='Dropdown' Group='Custom Columns'

      FillInChoice='FALSE' StaticName='Surya' Name='Surya'>

            <CHOICES>

                <CHOICE>YES</CHOICE>

                <CHOICE>NO</CHOICE>

            </CHOICES>

           </Field>"

      $web.Fields.AddFieldAsXml($suryafield)

  Write-Host "Field Created"

 }

 Stop-SPAssignment -Global