How to get second MAXIMUM DATE in MYSQL

Question

I want to fetch my record from mysql db. I want to fetch second maximum date from the record. But i failed

Here is my code

Answer 1

Note that the schema setup, QueryA and QueryB are all just for visualization.

Whereas, QueryC is the one for you to try with your data.

The reason this does not do a simple order by and limit that @Musa does is simple: you can have many rows with the second greatest date, not one. That is why is uses a variables for @grp and @prevdate to target the second group.

Schema setup

-- drop table specimenA;
create table specimenA
(   mypk int auto_increment primary key,
    id int not null,    -- note, not autoinc or pk
    theDate date not null,
    title varchar(255) not null,
    otherThing varchar(20) not null
    -- etc
    -- not other indexes whatsoever
);
-- truncate table specimenA
insert specimenA (id,theDate,title,otherThing) values
(170,'2007-09-19','whatever','whatever'),
(170,'2008-09-12','whatever','whatever'),
(170,'2010-01-15','whatever','whatever'),
(170,'2011-02-03','whatever','whatever'),
(170,'2012-06-26','whatever','whatever'),
(170,'2013-03-05','whatever','whatever'),
(170,'2014-06-25','whatever','whatever'),
(170,'2015-06-09','whatever','whatever'),

(917,'2009-10-14','whatever','whatever'),
(917,'2008-12-31','whatever','whatever'),

(109,'2010-04-26','whatever','whatever'),
(109,'2011-03-02','whatever','whatever'),
(109,'2012-06-25','whatever','whatever'),
(109,'2013-01-04','whatever','whatever'),
(109,'2014-03-28','whatever','whatever'),
(109,'2015-03-18','whatever','whatever'),

(1057,'2014-03-28','whatever','whatever'),
(1057,'2014-11-21','whatever','whatever'),
(1057,'2015-08-13','whatever','whatever');

QueryA

set @rn:=0,@grp:=0,@prevdate:=''; 
select id,theDate,title,otherThing,
@rn:=@rn+1 as rownum, 
@grp:=if(@prevdate=theDate,@grp,@grp+1) as descGrp, 
@prevdate:=theDate as unused 
from specimenA 
order by theDate DESC -- **** Note this
-- DESC means greatest first, as is most-recent first for dates
+------+------------+----------+------------+--------+---------+------------+
| id   | theDate    | title    | otherThing | rownum | descGrp | unused     |
+------+------------+----------+------------+--------+---------+------------+
| 1057 | 2015-08-13 | whatever | whatever   |      1 |       1 | 2015-08-13 |
|  170 | 2015-06-09 | whatever | whatever   |      2 |       2 | 2015-06-09 |
|  109 | 2015-03-18 | whatever | whatever   |      3 |       3 | 2015-03-18 |
| 1057 | 2014-11-21 | whatever | whatever   |      4 |       4 | 2014-11-21 |
|  170 | 2014-06-25 | whatever | whatever   |      5 |       5 | 2014-06-25 |
| 1057 | 2014-03-28 | whatever | whatever   |      6 |       6 | 2014-03-28 |
|  109 | 2014-03-28 | whatever | whatever   |      7 |       6 | 2014-03-28 |
|  170 | 2013-03-05 | whatever | whatever   |      8 |       7 | 2013-03-05 |
|  109 | 2013-01-04 | whatever | whatever   |      9 |       8 | 2013-01-04 |
|  170 | 2012-06-26 | whatever | whatever   |     10 |       9 | 2012-06-26 |
|  109 | 2012-06-25 | whatever | whatever   |     11 |      10 | 2012-06-25 |
|  109 | 2011-03-02 | whatever | whatever   |     12 |      11 | 2011-03-02 |
|  170 | 2011-02-03 | whatever | whatever   |     13 |      12 | 2011-02-03 |
|  109 | 2010-04-26 | whatever | whatever   |     14 |      13 | 2010-04-26 |
|  170 | 2010-01-15 | whatever | whatever   |     15 |      14 | 2010-01-15 |
|  917 | 2009-10-14 | whatever | whatever   |     16 |      15 | 2009-10-14 |
|  917 | 2008-12-31 | whatever | whatever   |     17 |      16 | 2008-12-31 |
|  170 | 2008-09-12 | whatever | whatever   |     18 |      17 | 2008-09-12 |
|  170 | 2007-09-19 | whatever | whatever   |     19 |      18 | 2007-09-19 |
+------+------------+----------+------------+--------+---------+------------+

And, taking the above select statement, and making it a derived table as alias inR, nested:

QueryB

set @rn:=0,@grp:=0,@prevdate:=''; 
select id,theDate,title,otherthing 
from 
(   select id,theDate,title,otherThing,
    @rn:=@rn+1 as rownum, 
    @grp:=if(@prevdate=theDate,@grp,@grp+1) as descGrp, 
    @prevdate:=theDate as unused 
    from specimenA 
    order by theDate DESC  -- **** Note this
) inR 
where descGrp=2;
+-----+------------+----------+------------+
| id  | theDate    | title    | otherthing |
+-----+------------+----------+------------+
| 170 | 2015-06-09 | whatever | whatever   |
+-----+------------+----------+------------+

And there is your second greatest date. Meaning second most-recent date.

---

So, taking your original select statement, same concept. The motivation for showing the above is simply this: InR is just a Derived Table, no more or less than your select statement that will become a Derived Table.

QueryC

set @rn:=0,@grp:=0,@prevdate:=''; 

select client_id, cid, tid, aid, oid, opinion, notification_date,
ttitle, atitle, otitle, ltitle, stitle,
opinion_id, pcid, pr_client, address, liaison_one, 
cityid, head_office_id, city, cname
from
(   SELECT r.client_id as client_id,c.id as cid,t.id as tid,a.id as aid,o.id as oid,c.name as opinion, r.notification_date, 
    t.title as ttitle,a.title as atitle,o.title as otitle, l.title as ltitle, s.title as stitle, 
    pr.opinion_id, pc.id as pcid, pr.client_id as pr_client, pc.address, pc.liaison_one, 
    city.id as cityid, pc.head_office_id, city.city, pc.title as cname,
    @rn:=@rn+1 as rownum, 
    @grp:=if(@prevdate=r.notification_date,@grp,@grp+1) as descGrp, 
    @prevdate:=r.notification_date as unused 

    FROM og_ratings r 
        LEFT join
    (
      select max(notification_date) notification_date,
        client_id
      from og_ratings
      WHERE notification_date NOT IN (select max(notification_date) FROM og_ratings )
       ) r2
      on r.notification_date = r2.notification_date
      and r.client_id = r2.client_id
    LEFT JOIN og_companies c
    ON r.client_id = c.id
    LEFT JOIN og_rating_types t
    ON r.rating_type_id = t.id
    LEFT JOIN og_actions a
    ON r.pacra_action = a.id
    LEFT JOIN og_outlooks o
    ON r.pacra_outlook = o.id
    LEFT JOIN og_lterms l
    ON r.pacra_lterm = l.id
    LEFT JOIN og_sterms s
    ON r.pacra_sterm = s.id
    LEFT JOIN pacra_client_opinion_relations pr
    ON pr.opinion_id = c.id
    LEFT JOIN pacra_clients pc
    ON pc.id = pr.client_id
    LEFT JOIN city
    ON city.id = pc.head_office_id
    WHERE r.client_id  IN (SELECT opinion_id FROM pacra_client_opinion_relations WHERE client_id = 50)
    order by r.notification_date DESC
) inR
where descGrp=2

QueryC is what you go with. As it is two statements

• The initialization of the variables
• and the large query string

... you need to run them in that order with query, one for each, in that order, or use PHP multi-query and combine both in one call. That link in previous sentence was for mysqli, the concept is hereby revealed, modify accordingly.