Oracle SQL: Trying to exclude rows based on a combination of column values

Question

I have a table with a list of IDs that I need to exclude rows from. For each row, an ID can have one value in the comment_code column. I need to exclude IDs from my results that have a combination of two specific values and keep IDs that have only one of those two values. Sorry if this isn't clear.

Table example:

ID     SEQUENCE     FUNCTION     COMMENT_CODE
---------------------------------------------------------------
1        1             tree          apple
1        2             bush          orange
2        1             tree          apple
2        2             tree          banana
3        1             bush          strawberry

Output needed:

ID     SEQUENCE     FUNCTION     COMMENT_CODE
---------------------------------------------------------------
2        1             tree          apple

Basically, if an ID has a row with 'apple' as the comment_code and a row with 'orange' as the comment code, I don't want to see that ID in my results. If an ID has a row with 'apple' as a comment code, I want to see them in my results regardless of any other comment_code they may have as long as they don't have the orange comment code.

Any help would be greatly appreciated. I've tried using a combination of exists and not exists clauses as well as listagg to group the comment_code values together for each ID, but I'm not getting the expected result.

Answer 1

This approach uses aggregation to find all ids that have both values. This is used as an exclusion list using a left outer join:

select *
from table t left outer join
     (select id
      from table t
      group by t.id
      having sum(case when comment = 'apple' then 1 else 0 end) > 0 and
             sum(case when comment = 'orange' then 1 else 0 end) > 0
     ) toexclude
     on t.id = toexclude.id
where toexclude.id is null;

Answer 2

Something like this should work.

select *
from yourtable
where sequence = 1
and whatever

Answer 3

select *
from table t
where exists (select 1 from dual
where t.function = 'tree' and t.comment_code = 'apple')