How to get least date value

Question

Hi
How to get least date value if my data is like this,
order_id date
121 03-mar-12
232 30-jan-10
343 14-may-11
I want to pic least date value(i.e. 03-mar-12) from the list
can any one help me on this
Thanks,
Lakshman
Edited by: kolipaka on Jun 29, 2012 4:21 PM

Answer 1

Hi, Lakshman,
kolipaka wrote:
Hi
How to get least date value if my data is like this,
order_id date
121 03-mar-12
232 30-jan-10
343 14-may-11
I want to pic least date value(i.e. 03-mar-12) from the list
can any one help me on this
Thanks,
Lakshman
Edited by: kolipaka on Jun 29, 2012 4:21 PM30-Jan-2010 is the earliest (least) date in that data (assuming that's a DATE column, and all the dates are in the same century). To find the earliest date, you could say:
SELECT  MIN (dt)    AS first_date
FROM    table_x
;DATE is not a good column name, so I used DT instead.
03-Mar-2012 is the date related to the least order_id. To find that, you could say
SELECT  MIN (dt) KEEP (DENSE_RANK FIRST ORDER BY order_id)  AS dt_or_least_order_id
FROM    table_x;If you wanted to find several columns from the row with the earliest order_id, you could do a Top-N Query , like this:
WITH  got_r_num  AS
    SELECT  x.*
    ,       ROW_NUMBER () OVER (ORDER BY  order_dt)   AS r_num
    FROM    table_x  x
SELECT  *    -- or list all columns except r_num
FROM    got_r_num
WHERE   r_num   = 1
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using.
See the forum FAQ {message:id=9360002}