Count (*) that is a conditional statement and then if the result

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_2

I need to perform a count (*) on agr_line_no on the condition that there is other other objects 'CAR' that is to say if forpolicy_no = 2005 the count should be 4.

Be Table_1 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 it is if the number is > 1, 'Y' must be returned to another "n".

Also, there must be a clause where clause that is to say when table_1.incident_date between .cover_start_date table_2 and table_2 .cover_end_date

Final result should look 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_1

Thanks in advance!

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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 assumed policy_no either the primary key in Table_1 - so max (table_1.incident_date) will work.

If you have an index on Table_2 on coverage dates, then the construction above could be better than one between. Otherwise between will be quite OK ;-)

Tags: Database

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