How to Combine two queries into one in Oracle SQL - sql

Question

We have an error in production, luckily have a manual solution for this, however I have to run below two queries every morning to fix the error. This is so manual, I want to automate this and combine two queries into one. However we only have this error in production and not in DEV or QA, if I mess up with the combining query that will end up a chaos, So I need your expertise.
1st Query brings project numbers
select id, ugenProjectNumber
from unifier_uxpecai
where (pecaiChecklistNumber = 0 or pecaiChecklistNumber is null)
or (pecaiChecklistItemNumber = 0 or pecaiChecklistItemNumber is null)
2nd Query fix broken links between action items and list items, I manually put 1st query results unique project numbers into second query and run the second query per each unique project numbers.
update unifier_uxpecai pai
set (pai.pecaiChecklistNumber, pai.pecaiChecklistItemNumber) =
(
select pcl.id, pcli.id
from unifier_uxpecl pcl
inner join unifier_uxpecl_lineitem pcli on pcli.uuu_tab_id = 0 and
pcli.record_id = pcl.id
where pcl.ugenProjectNumber = 'GL-16-161010-143502'
and pcli.pecItemActionItemBPC = pai.id
)
where exists
(
select pcli.pecItemActionItemBPC
from unifier_uxpecl pcl
inner join unifier_uxpecl_lineitem pcli on pcli.uuu_tab_id = 0 and
pcli.record_id = pcl.id
where pcl.ugenProjectNumber = 'GL-16-161010-143502'
and pcli.pecItemActionItemBPC = pai.id
)
and (pai.pecaiChecklistNumber = 0 or pai.pecaiChecklistItemNumber = 0)

Answer 1

You can incorporate the logic into the queries:
update unifier_uxpecai pai
set (pai.pecaiChecklistNumber, pai.pecaiChecklistItemNumber) =
(select pcl.id, pcli.id
from unifier_uxpecl pcl join
unifier_uxpecl_lineitem pcli
on pcli.uuu_tab_id = 0 and pcli.record_id = pcl.id
where pcl.ugenProjectNumber in (select ugenProjectNumber
from unifier_uxpecai
where (pecaiChecklistNumber = 0 or pecaiChecklistNumber is null) or
(pecaiChecklistItemNumber = 0 or pecaiChecklistItemNumber is null
) and
pcli.pecItemActionItemBPC = pai.id
)
where exists
(
select pcli.pecItemActionItemBPC
from unifier_uxpecl pcl join
unifier_uxpecl_lineitem pcli
on pcli.uuu_tab_id = 0 and
pcli.record_id = pcl.id
where pcl.ugenProjectNumber in (select ugenProjectNumber
from unifier_uxpecai
where (pecaiChecklistNumber = 0 or pecaiChecklistNumber is null) or
(pecaiChecklistItemNumber = 0 or pecaiChecklistItemNumber is null
) and
pcli.pecItemActionItemBPC = pai.id
) and
(pai.pecaiChecklistNumber = 0 or pai.pecaiChecklistItemNumber = 0)