find a value that is the most

Let's say I have a column with different values, now I want to find a value located most, how is the best way to make this request?
Is the best solution to do this way:
WITH t AS
 (SELECT 'a' AS VALUE  FROM Dual  UNION ALL
  SELECT 'b'  FROM Dual  UNION ALL
  SELECT 'a' FROM Dual)
SELECT VALUE
FROM (SELECT t.Value, COUNT(*) AS Cnt
           FROM t
           GROUP BY t.Value
           ORDER BY Cnt DESC
          )
WHERE Rownum = 1
As you can see that the value 'a' is more time in table T, then the query must exit the 'a' and nothing more. If the number of occurrences of the 'a' and 'b' would be the same, then the application should exit one of them, no matter which.
As you can see query now does not seem to be well optimized, I think.
(Oracle 10g)

Or

SQL> with t
     as (
  select 'a' as value from dual union all
  select 'b' from dual union all
  select 'b' from dual
)
--
--
select max (value) keep (dense_rank last order by count (*)) value,
       count(*) cnt
  from t
group by value
/
VALUE        CNT
----- ----------
b              2
1 row selected.

Published by: MichaelS on December 14, 2010 10:39

CNT added.

Tags: Database

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COMMIT;

    user4587979 wrote:
    Hi Frank

    Yes, but I had more than 2 tables with item_characteristics, type_characteristics

    If there are other tables involved, then CREATE TABLE and INSERT statements for them (for the relevant columns only). You must not post a lot of examples of data; usually just a couple of lines per table is enough to show the problem.
    Also post the results desired from these data.

    What I try to do is, I'm comparing new_value in log_item_characteristics (whichever is most recent) with CHR_VALUE in the item_characteristics and the needs of different output values

    I am trying to query is not giving desired out put

    Point out some places where the output is wrong and explain how you get good results in these places, using specific examples from the data sample.

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lic.TYPE_NAME, ic.CHR_VALUE, lic.NEW_VALUE,  lic.MODIFIED_BY,  lic.MODIFIED_ON,
ic.CREATED_BY, ic.CREATED_ON,ic.MODIFIED_BY, ic.MODIFIED_ON
from log_item_characteristics lic, item_characteristics ic,type_characteristics tc  where
lic.TYPE_NAME=tc.TYPE_NAME
and lic.CHARACTERISTIC_NAME=tc.CHR_NAME
and lic.PIRM_ID=ic.PIRM_ID
and tc.CHR_ID=ic.CHR_ID and ic.CHR_VALUE <> lic.NEW_VALUE
and lic.pirm_id in ('0307490N','0307521C')
order by lic.pirm_id

    Thank you; It is useful to see the existing query. Really, you have to format your code.

    Please can you help me

    What you've posted so far is like saying "I'm going 200 meters to the North, and then 500 meters East, but I'm not getting where I want to go." I would have a better chance to help you if you said, 'I'm out of my house, at 100, Elm Street and try to get to the supermarket at Broadway 279. I'm going 200 meters to the North... ', or, even better. "I want to buy a newspaper and some orange juice, so I thought I'd go to a convenience store. I start at my house, at 100, Elm Street... »
    Always post some examples of data (CREATE TABLE and INSERT statements, as you did in your first post) and the desired results from these data. Explain how you get these results from these data.

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