SQL query clarification

Question

Hi,
I have a table called inst_hst contains
institution_id modifiedate_time institution_status_code
3316 1/7/2009 AP
3316 9/13/2009 RE
3316 1/28/2010 SB
here i want to get the last modified date time record for example... the latest record here is
3316 1/28/2010 SB should be return... i dont want to retrieve other institution id...
can anyone please give me the query to retrieve the above value

Answer 1

user572087 wrote:
Hi,
Thanks for your reply.. But i have more than one institution id like this... for example
3316 1/1/2001 SB
3316 1/2/2001 RE
3316 1/3/2001 AP
3317 1/1/2001 SB
3317 1/2/2001 RE
3318 1/3/2001 AP
3318 1/4/2001 SB
Hi,
In your sample data code 'AP' and 'RE' has two records with same date. so the result will look like this.
PRAZY@solarc> with  T  as
  2  (
  3  select 3316 institution_id, '1/1/2001' modifiedate_time, 'SB' institution_status_code From dual
  4  UNION
  5  select 3316, '1/2/2001', 'RE' From dual
  6  UNION
  7  select 3316, '1/3/2001', 'AP' From dual
  8  UNION
  9  select 3317, '1/1/2001', 'SB' From dual
10  UNION
11  select 3317, '1/2/2001', 'RE' From dual
12  UNION
13  select 3318, '1/3/2001', 'AP' From dual
14  UNION
15  select 3318, '1/4/2001', 'SB' From dual
16  )
17  select *
18  from (select t1.*, Dense_rank() over
19  (partition by institution_status_code order by modifiedate_time Desc) NewRow from T t1)
20  where NewRow=1;
INSTITUTION_ID MODIFIED IN     NEWROW
          3316 1/3/2001 AP          1
          3318 1/3/2001 AP          1
          3316 1/2/2001 RE          1
          3317 1/2/2001 RE          1
          3318 1/4/2001 SB          1
Elapsed: 00:00:00.00or
IF you just want to retrieve 1st record alone you can go with row_number instead of dense_rank
PRAZY@solarc> with  T  as
  2  (
  3  select 3316 institution_id, '1/1/2001' modifiedate_time, 'SB' institution_status_code From dual
  4  UNION
  5  select 3316, '1/2/2001', 'RE' From dual
  6  UNION
  7  select 3316, '1/3/2001', 'AP' From dual
  8  UNION
  9  select 3317, '1/1/2001', 'SB' From dual
10  UNION
11  select 3317, '1/2/2001', 'RE' From dual
12  UNION
13  select 3318, '1/3/2001', 'AP' From dual
14  UNION
15  select 3318, '1/4/2001', 'SB' From dual
16  )
17  select *
18  from (select t1.*, row_number() over
19  (partition by institution_status_code order by modifiedate_time Desc) NewRow from T t1)
20  where NewRow=1;
INSTITUTION_ID MODIFIED IN     NEWROW
          3316 1/3/2001 AP          1
          3316 1/2/2001 RE          1
          3318 1/4/2001 SB          1or
Partition using institution_id if you want the result based on ID
PRAZY@solarc> with  T  as
  2  (
  3  select 3316 institution_id, '1/1/2001' modifiedate_time, 'SB' institution_status_code From dual
  4  UNION
  5  select 3316, '1/2/2001', 'RE' From dual
  6  UNION
  7  select 3316, '1/3/2001', 'AP' From dual
  8  UNION
  9  select 3317, '1/1/2001', 'SB' From dual
10  UNION
11  select 3317, '1/2/2001', 'RE' From dual
12  UNION
13  select 3318, '1/3/2001', 'AP' From dual
14  UNION
15  select 3318, '1/4/2001', 'SB' From dual
16  )
17  select *
18  from (select t1.*, row_number() over
19  (partition by institution_id order by modifiedate_time Desc) NewRow from T t1)
20  where NewRow=1
21  /
INSTITUTION_ID MODIFIED IN     NEWROW
          3316 1/3/2001 AP          1
          3317 1/2/2001 RE          1
          3318 1/4/2001 SB          1Regards,
Prazy