title: MS SQL update column with auto incremented value
body: <p>i recently imported some old data to a new SQL table and forgot to set the ID column to auto increment. </p>
  
  <p>Now i have several "NULL"s in the column named ID.</p>
  
  <p>Is there a way I can update all ID columns with an unique ID automatically?
  sadly i have no clue how</p>
  
  <p>After that I will be able to set the column to INT and Auto Increment.</p>
  
  <p>Thank you for your help.</p>