Selecting only one record per account number from each record.when multiple records exist

Experts,

I have a file that has multiple occurrences for the same account number.  The date is the same.  The file has multiple fields on it. I want only one record for each account.

The query below works for one column but my file has many columns.

How can I get just one record in each group?

SELECT  pat_acct_no
      From Test1 S1
       where pat_acct_no IN
      (Select TOP 1 pat_acct_no
        from Test1  S2
        where s1.pat_acct_no = S2.pat_acct_no
        Group  by  pat_acct_no
    )
    Group by pat_acct_no
    Order by pat_acct_no