Hi All, I saw new concept of included column in sql 2005, but when I was trying to create index. I just wanted to know what is it and I have a small question for this also. I have a table which contains 20 columns. I need a unique index on 18 numbers of columns which throws me an error â€œmaximum 16 columns can be possible for an indexâ€. Then I tried with this included column concepts and its possible now... but when I am trying to insert data. Its not checking my uniqueness of data.. Why So..?? Thanks, Sandy.