CODEWITHSUNDEEP
mysql
djmzfKnm
djmzfKnm

Reputation: 27195

query for selecting different recent records with different categoryid

I have following db structure in mysql.

Table: Story

Id Name categoryid date
1  Pa   4          2011-03-22 09:56:15
2  Pb   1          2011-03-23 09:56:16
3  Pc   2          2011-03-24 09:56:17
4  Pd   3          2011-03-25 09:56:18
5  Pe   1          2011-03-26 09:56:19
6  Pf   2          2011-03-27 09:56:20
7  Pg   3          2011-03-28 09:56:22
8  Ph   1          2011-03-29 09:56:23

I want to select results in a way so that it should select only 4 records, 1 for each categoryid.

I need to show result as below, latest record from each category.

Id Name categoryid date
8  Ph   1          2011-03-29 09:56:23
6  Pf   2          2011-03-27 09:56:20
7  Pg   3          2011-03-28 09:56:22
1  Pa   4          2011-03-22 09:56:15

Is it possible, please help me to make this query.

Upvotes: 0

Views: 127

Answers (3)

Andre Backlund
Andre Backlund

Reputation: 6943

SELECT Id, Name, categoryid, date FROM story GROUP BY categoryid ORDER BY date

Upvotes: 0

Nicola Cossu
Nicola Cossu

Reputation: 56397

select t1.* from categories as t1
inner join (
select categoryid,max(date) as date
from categories
group by categoryid) as t2
on t1.categoryid = t2.categoryid and t1.date = t2.date


alter table categories add index i (categoryid,date);

Upvotes: 0

Chandu
Chandu

Reputation: 82933

Try this:

SELECT *
  FROM categories 
 WHERE (categoryid, date) IN 
       (
        SELECT categoryid, MAX(date)
          FROM categories
          GROUP BY categoryid
       )

Upvotes: 3

Related Questions