How to get the first and last record

Question

Hai All
I have table called T1 and there are more than 8 lakhs records and i have a column called Timestamp so i need to get the first record value and time stampvalue and last record and time stamp value so that i can conclude that For Example
form 13 june to 15 june data are here
Kind Regards
SrikkanthM

Answer 1

Something like this can also indicate the first and last rows as you query...
SQL> select empno, ename, hiredate
  2        ,case row_number() over (order by hiredate)
  3           when 1 then 'First Row'
  4           when count(*) over () then 'Last Row'
  5         end as flag
  6  from emp;
     EMPNO ENAME      HIREDATE            FLAG
      7369 SMITH      17/12/1980 00:00:00 First Row
      7499 ALLEN      20/02/1981 00:00:00
      7521 WARD       22/02/1981 00:00:00
      7566 JONES      02/04/1981 00:00:00
      7698 BLAKE      01/05/1981 00:00:00
      7782 CLARK      09/06/1981 00:00:00
      7844 TURNER     08/09/1981 00:00:00
      7654 MARTIN     28/09/1981 00:00:00
      7839 KING       17/11/1981 00:00:00
      7900 JAMES      03/12/1981 00:00:00
      7902 FORD       03/12/1981 00:00:00
      7934 MILLER     23/01/1982 00:00:00
      7788 SCOTT      19/04/1987 00:00:00
      7876 ADAMS      23/05/1987 00:00:00 Last Row
14 rows selected.
SQL>