CODEWITHSUNDEEP
mysqlsqloracle-database
anandkk
anandkk

Reputation: 71

Retrieve the second last record for each user from the database

I have a table that holds username, updated date, and status as below:

name | Updated_on | Status

akg     29-NOV-10       Active
akg     13-JAN-12       NonActive
akg     10-MAR-12       Active
ems     23-JUL-12       NonActive
ems     10-SEP-10       Active
tkp     10-SEP-10       NonActive
tkp     13-DEC-10       Active
tkp     02-JUL-12       NonActive
tkp     24-SEP-10       Active
aron    12-JAN-11       NonActive
aron    07-NOV-11       Active
aron    25-JUN-12       NonActive

In this table user status is updated every time we change the status (ie a username can have many entries as shown in the table.

I would like the second last updated record for each user. ie for the above table, the result should be:

name | Updated_on | Status

akg     13-JAN-12       NonActive
ems     10-SEP-10       Active
tkp     13-DEC-10       Active
aron    07-NOV-11       Active

I'm really confused as I want to get the record of each users in this.

Is there any query which can be used for this?

Thank you

Upvotes: 0

Views: 1949

Answers (3)

user330315
user330315

Reputation:

As you tagged this (also) with Oracle:

select name, updated_on, status
from (
  select name, updated_on, status,
         row_number() over (partition by name order by updated_on desc) as rn,
         count(*) over (partition by name) as max_rn
  from userstatus
) 
where rn = max_rn - 1 
   or max_rn = 1;

This will actually work on a wide range of DBMS (including Oracle) - just not on MySQL.

Upvotes: 1

Gerard Yin
Gerard Yin

Reputation: 1313

You could try that, it's a bit verbose but it works:

SELECT
  name,
  max(Updated_on) as Updated_on,
  STATUS
FROM userstatus a
  WHERE (name, Updated_on) not in
  (select name, max(Updated_on) FROM userstatus group by name)
group by name, status
HAVING UPDATED_ON =
  (SELECT MAX(UPDATED_ON) FROM userstatus b where a.name = b.name
   and (b.name, b.Updated_on) not in
  (select name, max(Updated_on) FROM userstatus group by name)
  group by name);

Sqlfiddle

Upvotes: 1

Eugen Rieck
Eugen Rieck

Reputation: 65264

SELECT * FROM (
  SELECT
    rounda.*
  FROM
    userstatus AS rounda
    INNER JOIN userstatus AS roundb
      ON rounda.name=roundb.name
      AND rounda.Updated_on<roundb.Updated_On
  ORDER BY Updated_on DESC
) AS baseview
GROUP BY name

See sqlfiddle

Upvotes: 1

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