Help required for PLSQL or with some Analytical Function.

Question

Hello All
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
I have couple of questions with following dataset and insert into a table
With t As
SELECT '2011' YR, FN1 File_name,1 rec_seq From Dual Union All
SELECT '2011' YR, FN1 File_name,2 rec_seq From Dual Union All
SELECT '2011' YR, FN1 File_name,3 rec_seq From Dual Union All
SELECT '2011' YR, FN1 File_name,4 rec_seq From Dual Union All
SELECT '2011' YR, FN1 File_name,5 rec_seq From Dual Union All
SELECT '2011' YR, FN1 File_name,6 rec_seq From Dual Union All
SELECT '2012' YR, FN1 File_name,7 rec_seq From Dual Union All
SELECT '2011' YR, FN1 File_name,8 rec_seq From Dual Union All
SELECT '2010' YR, FN1 File_name,9 rec_seq From Dual
SELECT C_CAND_ID,MAX(C_CAND_ID) OVER (PARTITION BY C_CAND_ID ORDER BY YR) FROM
SELECT DISTINCT COUNT(*) OVER (PARTITION BY YR ORDER BY FILE_NAME) "C_CAND_ID",
YR
FROM
(select YR, FIle_name
from t
How to find year which is not equal to count with maximum year (2011) and insert into errorlog table
How to find all distinct years --- 2011, 2012 and 2010 and insert into error log table
Target table is
Create table errorlog
(Error_code number,
Errorheader varchar2(100),
error_details varchar2(1000),
rec_sequence     number
output is
errorcode     errorheader               errordetails                         rec_sequence
1          Year not as maximum count     The year 2012 not equal to 2011 the max count          7
1          Year not as maximum count     The year 2010 not equal to 2011 the max count          9
2          distinct years are          the distinct years are 2010,2011,2012               0
also I have couple of other questions like
How to find YR with maximum number of records ----- the answer should be 2011.
How to find count of distinct years ---- the answer should be 3
Please give me some guidence or help
Thanks

Answer 1

How to find year which is not equal to count with maximum year (2011) and insert into errorlog table
How to find all distinct years Maybe following query gives you a start to identify the necessary information:
SQL> with t as
select '2011' yr, 'fn1' file_name,1 rec_seq from dual union all
select '2011' yr, 'fn1' file_name,2 rec_seq from dual union all
select '2011' yr, 'fn1' file_name,3 rec_seq from dual union all
select '2011' yr, 'fn1' file_name,4 rec_seq from dual union all
select '2011' yr, 'fn1' file_name,5 rec_seq from dual union all
select '2011' yr, 'fn1' file_name,6 rec_seq from dual union all
select '2012' yr, 'fn1' file_name,7 rec_seq from dual union all
select '2011' yr, 'fn1' file_name,8 rec_seq from dual union all
select '2010' yr, 'fn1' file_name,9 rec_seq from dual
select max (yr) keep (dense_rank last order by cnt_yr) over () max_cnt_yr, /* gives you the year with the most entries */
       t.*  /* rest of table */
  from (select count (yr) over (partition by yr) cnt_yr,   /*  counts of a particular year ? */
               count (distinct yr) over () cnt_distinct_yr,  /*  how many distinct years ? */
               t.*
          from t) t
MAX_CNT_YR          CNT_YR CNT_DISTINCT_YR YR   FILE_NAME         REC_SEQ
2011                     1               3 2010 fn1                     9
2011                     7               3 2011 fn1                     2
2011                     7               3 2011 fn1                     3
2011                     7               3 2011 fn1                     4
2011                     7               3 2011 fn1                     6
2011                     7               3 2011 fn1                     1
2011                     7               3 2011 fn1                     5
2011                     7               3 2011 fn1                     8
2011                     1               3 2012 fn1                     7
9 rows selected.