title: How to add an uniqueidentifier column and insert values
body: <p>Can any body please, give me some ideas here. I have a huge table with 189999 rows. I need to select only the middle values of it. How can I do it. I added unique identifier column. How do I insert the values in it. Please, suggest. i would really appreciate your helps.
  I have accepted the answers not. I did not know how to do it before.
  Thank you all</p>