Finding fields to update based on combinations - sql

Question

I need to be able to display in my results who needs updates. I have a temp table I created that looks like this. The rule is per ID they cannot have more than 1 MASTER = 1. They must have FULLTIME = 1 on that record and all other records will be FULLTIME = 0 and PARTTIME = 1. This is quite difficult because you have to compare across multiple IDs.
I've tried combinations using maxes, count distinct, subqueries, etc. No luck getting it done. I've even tried to do some manipulation in Excel but it's totally confusing to me.
select distinct
x.ID,
COUNT(x.ID) AS ID_Count
from #FT0PT1M1Version2 as x
join (
select
ID, NAME, MASTER, FULLTIME, PARTTIME
from #FT0PT1M1Version2
WHERE E = 'P'
GROUP BY
ID, NAME, MASTER, FULLTIME, PARTTIME
HAVING COUNT(ID) = '1'
) as y
on x.ID = y.ID
WHERE
x.PARTTIME = '1' and
x.MASTER = '1'
group by x.ID
HAVING COUNT(x.ID) = '1'
order by 1
Temp Table
ID NAME MASTER FULLTIME PARTTIME
1 JAMES JONES 0 1 0
1 JAMES JONES 1 0 1
1 JAMES JONES 0 0 1
2 MICHEAL JORDAN 1 1 0
2 MICHEAL JORDAN 0 0 1
2 MICHEAL JORDAN 0 0 1
3 JOHN DOE 1 1 0
3 JOHN DOE 0 0 1
Expected Results
ID NAME MASTER FULLTIME PARTTIME UPDATE
1 JAMES JONES 0 1 0 Y
1 JAMES JONES 1 0 1 Y
1 JAMES JONES 0 0 1 N
2 MICHEAL JORDAN 1 1 0 N
2 MICHEAL JORDAN 0 0 1 N
2 MICHEAL JORDAN 0 0 1 N
3 JOHN DOE 1 1 0 N
3 JOHN DOE 1 0 1 Y

Answer 1

You could try below query but I would prefer to put a check constraint on columns like check if master=1 then update ='Y' something like that.
SELECT ID, NAME,
CASE
WHEN (MASTER=1 AND FULLTIME=1 And PARTTIME=0)
OR (MASTER=0 AND FULLTIME=0 And PARTTIME=1)
Then 'N'
ELSE 'Y'
END as "Update"
from table group by ID, NAME, Update
Having sum(Master) = 1;