Count(*) that is conditioned and then case statement of result

Question

Hi: This is table_1 :
with Table_1
as
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') incident_date, 2005 Policy_no  from dual
      union all
      select to_date('04-MAR-2009 12:12','DD-MON-YYYY HH24:MI') incident_date, 2009 Policy_no  from dual
      union all
      select to_date('25-JUL-2010 23:30','DD-MON-YYYY HH24:MI') incident_date, 2013 Policy_no  from dual
select * from Table_1
with Table_2
as
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 100 agr_line_no, 'BIKE' object  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 200 agr_line_no, 'BUCKS'  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 300 agr_line_no, 'CELL'  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 400 agr_line_no, 'CAR'  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 500 agr_line_no, 'HOUSE'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 100 agr_line_no, 'BIKE' object  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 200 agr_line_no, 'BUCKS'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 300 agr_line_no, 'BEACH'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 400 agr_line_no, 'CAR'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 500 agr_line_no, 'HOUSE'  from dual
      union all
      select to_date('20-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('29-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2013 Policy_no, 676 agr_line_no, 'CAR'  from dual
select * from Table_2I need to perform a count(*) on agr_line_no for the condition that there are other objects other than 'CAR' ie so forpolicy_no = 2005 the count must be 4.
Table_1 must join to table_2 on Policy_no and all columns in table_1 must be selected as well as an additional column called Object_many.
Object_many is based on the count(*) from table_2 ie if the count is > 1 then 'Y' must be returned else 'N'
Also there must be a where clause ie where table_1.incident_date is between table_2 .cover_start_date and table_2 .cover_end_date
Final Result Should look something like this
with Table_1
as
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') incident_date, 2005 Policy_no, 'Y' Object_many from dual
      union all
      select to_date('04-MAR-2009 12:12','DD-MON-YYYY HH24:MI') incident_date, 2009 Policy_no, 'Y' Object_many from dual
      union all
      select to_date('25-JUL-2010 23:30','DD-MON-YYYY HH24:MI') incident_date, 2013 Policy_no, 'N' Object_many from dual
select * from Table_1Thanks in advance!!
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Answer 1

with Table_1
as
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') incident_date, 2005 Policy_no  from dual
      union all
      select to_date('04-MAR-2009 12:12','DD-MON-YYYY HH24:MI') incident_date, 2009 Policy_no  from dual
      union all
      select to_date('25-JUL-2010 23:30','DD-MON-YYYY HH24:MI') incident_date, 2013 Policy_no  from dual
), Table_2
as
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 100 agr_line_no, 'BIKE' object  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 200 agr_line_no, 'BUCKS'  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 300 agr_line_no, 'CELL'  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 400 agr_line_no, 'CAR'  from dual
      union all
      select to_date('01-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('04-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2005 Policy_no, 500 agr_line_no, 'HOUSE'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 100 agr_line_no, 'BIKE' object  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 200 agr_line_no, 'BUCKS'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 300 agr_line_no, 'BEACH'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 400 agr_line_no, 'CAR'  from dual
      union all
      select to_date('01-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('09-MAR-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2009 Policy_no, 500 agr_line_no, 'HOUSE'  from dual
      union all
      select to_date('20-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_start_date, to_date('29-JUL-2009 20:10','DD-MON-YYYY HH24:MI') Cover_end_date, 2013 Policy_no, 676 agr_line_no, 'CAR'  from dual
-- end-of-test-data
select
table_1.policy_no,
max(table_1.incident_date) incident_date,
case when count(table_2.agr_line_no) > 1 then 'Y' else 'N' end object_many
from table_1
left outer join table_2
   on table_2.policy_no = table_1.policy_no
   and table_2.cover_start_date <= table_1.incident_date
   and table_2.cover_end_date >= table_1.incident_date
   and table_2.object != 'CAR'
group by
table_1.policy_no
order by
table_1.policy_no;I have assumed policy_no to be primary key in Table_1 - therefore max(table_1.incident_date) will work.
If you have an index on Table_2 on the cover dates then the above construction might be better than a between. Otherwise between will be quite OK ;-)