Re: Retrieve last N rows

On 21 May 2002 06:11:35 -0700, irfan_pk_at_hotmail.com (Md Irfan) wrote:
>Jim,
>We have table that does not contain date column. So normally some 50
>rows are inserted to this table daily. Just I want to see the last 50
>rows.

You need some column with an increasing value, if not the date then a sequence number that increases with each row. If you have that, you can sort on this column in descending order, and include in your query the clause

WHERE ROWNUM <= 50

Just to be on the safe side, I usually include this inside a subselect, e.g.

select * from
(
  select col1, col2 from my_table where x = y and a > b )
where rownum <= 50;

John

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