SELECT CASE withsubquery returs more than one line - oracle

Question

When I execute the code for partition_date = 2019-12-11 and for partition_date = 2019-07-06 I get an error saying 'The subquery returs more then one line'. For Other cases it works
select case when my_count <=1 AND status_ = 'END' then 0
when my_count >1 AND status_ IN ('END', 'RUNNING', 'START', 'ERR') THEN 1
ELSE -1
end AS W
INTO return_val
from (select
(SELECT count(DISTINCT(status)) FROM my_table
WHERE my_table.HIVE = 'hive1'
AND EXTRACT(MONTH FROM PARTITION_DATE) = EXTRACT(MONTH FROM TO_DATE('20191212', 'YYYY-MM-DD'))
AND EXTRACT(YEAR FROM PARTITION_DATE) = EXTRACT(YEAR FROM TO_DATE('20191212', 'YYYY-MM-DD'))
) my_count,
(SELECT DISTINCT(status) AS status_ FROM my_table
my_table.HIVE = 'hive1'
AND EXTRACT(MONTH FROM PARTITION_DATE) = EXTRACT(MONTH FROM TO_DATE('20191212', 'YYYY-MM-DD'))
AND EXTRACT(YEAR FROM PARTITION_DATE) = EXTRACT(YEAR FROM TO_DATE('20191212', 'YYYY-MM-DD'))
)status_
FROM dual
)x ;
RETURN(return_val);
my_table is like
STATUS |HIVE |PARTITION_DATE |
-------|-----|-------------------
END |hive1|2019-12-11 00:00:00|
START |hive1|2019-12-12 00:00:00|
NA |hive1|2019-12-13 00:00:00|
END |hive1|2019-09-12 00:00:00|
END |hive1|2019-09-13 00:00:00|
END |hive1|2019-09-14 00:00:00|
ERR |hive1|2019-08-06 00:00:00|
ERR |hive1|2019-07-06 00:00:00|
START |hive1|2019-07-07 00:00:00|
RUNNING|hive1|2019-07-08 00:00:00|
END |hive1|2019-07-09 00:00:00|

Answer 1

You have a few status in statement:
(SELECT DISTINCT(status) AS status_ FROM my_table
WHERE EL_F_BDP_PROC_REALTIME.HIVE = 'hive1'
AND EXTRACT(MONTH FROM PARTITION_DATE) = EXTRACT(MONTH FROM TO_DATE('20191212', 'YYYY-MM-DD'))
AND EXTRACT(YEAR FROM PARTITION_DATE) = EXTRACT(YEAR FROM TO_DATE('20191212', 'YYYY-MM-DD'))
)
and returned more one line.
For rigth execute you need return one value example:
max((SELECT DISTINCT(status) AS status_ FROM my_table
WHERE EL_F_BDP_PROC_REALTIME.HIVE = 'hive1'
AND EXTRACT(MONTH FROM PARTITION_DATE) = EXTRACT(MONTH FROM TO_DATE('20191212', 'YYYY-MM-DD'))
AND EXTRACT(YEAR FROM PARTITION_DATE) = EXTRACT(YEAR FROM TO_DATE('20191212', 'YYYY-MM-DD'))
))
Is it executing, but ,purhaps ,logic is wrong
Try it:
with tbl as (
select 'START' status, 'hive1' str, to_date('2019-12-11', 'yyyy-mm-dd') dt from dual
union all
select 'NA' status, 'hive1' str, to_date('2019-12-11', 'yyyy-mm-dd') from dual
union all
select 'END' status, 'hive1' str, to_date('2019-12-11', 'yyyy-mm-dd') from dual)
select dt, str, listagg(status, ' ') WITHIN GROUP (ORDER BY str)
from tbl
GROUP BY dt, str

Answer 2

Why don't you use group by,
SELECT case when my_count <=1 AND status_ = 'END' then 0
when my_count >1 AND status_ IN ('END', 'RUNNING', 'START', 'ERR') THEN 1
ELSE -1
end AS W
INTO return_val
from (select DISTINCT count(status) as my_count,status as status_ FROM my_table
WHERE EL_F_BDP_PROC_REALTIME.HIVE = 'hive1'
AND EXTRACT(MONTH FROM PARTITION_DATE) = EXTRACT(MONTH FROM TO_DATE('20191212', 'YYYY-MM-DD'))
AND EXTRACT(YEAR FROM PARTITION_DATE) = EXTRACT(YEAR FROM TO_DATE('20191212', 'YYYY-MM-DD'))
group by status)res ;