MYSQL Select priority data if exist - mysql

Question

My current data :
Month Price A Price B Status Approval
January 1000 2000 1 0
February 1000 2000 1 0
March 1000 2000 1 0
April 1000 2000 1 0
May 1000 2000 1 0
June 1000 2000 1 0
July 1000 2000 1 0
August 1000 2000 1 0
September 1000 2000 1 0
October 1000 3000 1 0
October 2000 2000 2 0
October 3000 2000 2 1
November 1000 2000 1 0
December 1000 2000 1 0
*Status 1 = Not Changed, Status 2 = Changed, Approval 1 = Approved
What i'm trying to show,is when month > 1 (my case is October)
,IF STATUS = 2 AND APPROVAL = 1 IS NOT EXIST,Show data with
STATUS = 1 AND APPROVAL = 0ELSE SHOW STATUS = 2 AND APPROVAL =
1 Using group by, doesn't work,it shows first data if month more
than 1
My Query :
SELECT A.NAME AS MONTH,
IFNULL( B.PRICE_A, 0 ) PRICE_A,
IFNULL( B.PRICE_B, 0 ) PRICE_B,
STATUS,
APPROVAL,
FROM
REF_MONTH A
LEFT OUTER JOIN (
SELECT
SUBSTR( PERIOD, '5,2' ) MONTH,
ROUND( PRICE_A_FIX, 2 ) PRICE_A,
ROUND( PRICE_B_FIX, 2 ) PRICE_B,
A.STATUS,
A.APPROVAL,
FROM
PRICE_MONTH_LIST A
WHERE
SUBSTR( PERIOD, 1, 4 ) = 2018
) B ON B.MONRH= A.MONTH
WHERE DATE_FORMAT( STR_TO_DATE( CONCAT( 2018, month), '%Y%m' ), '%Y%m' ) <=
DATE_FORMAT( SYSDATE( ), '%Y%m' )
GROUP BY A.MONTH
ORDER BY A.ID;
My Expected Result :
Month Price A Price B Status Approval
January 1000 2000 1 0
February 1000 2000 1 0
March 1000 2000 1 0
April 1000 2000 1 0
May 1000 2000 1 0
June 1000 2000 1 0
July 1000 2000 1 0
August 1000 2000 1 0
September 1000 2000 1 0
October 3000 2000 2 1
November 1000 2000 1 0
December 1000 2000 1 0

Answer 1

Below would be the query -
with table1 as
(
select 'January' as month, 1000 as priceA, 2000 as priceB, 1 as status, 0 as approval from dual
union all
select 'October' as month, 1000 as priceA, 3000 as priceB, 1 as status, 0 as approval from dual
union all
select 'October' as month, 2000 as priceA, 2000 as priceB, 2 as status, 0 as approval from dual
union all
select 'October' as month, 3000 as priceA, 2000 as priceB, 2 as status, 1 as approval from dual
)
,t1 as
(
select month, count(*) as cnt, min(status) as min_status,
max(status) max_status, min(approval) min_app, max(approval) max_app from table1
group by month
)
,t2 as
(
select
month,
case when cnt>1 and max_status<>2 and max_app<>1 then min_status else max_status end as status1,
case when cnt>1 and max_status<>2 and max_app<>1 then min_app else max_app end as approval1
from t1
)
select
t.month,
t.priceA,
t.priceB,
t.status,
t.approval
from table1 t
inner join t2 on t.month=t2.month and t.status=t2.status1 and t.approval=t2.approval1;
result -
January 1000 2000 1 0
October 3000 2000 2 1
As there were no insert scripts, I have use CTE with oralce db.
Hope this helps.