Get details of ungrouped columns in comma separated values in Sql-Server

Question

I want to get employee leaves whose lvdays sum is greater than 30 with all three table details . Not able to find a way out for this .

employee :

empcode| MNGR_CODE| MNGR_CODE2
-------|----------|-----------
AA     |   bb     |     cc 
FF     |   bb     |     cc

lvtype :

typeid| desc
------|---------
1     | casual

leave :

leaveid| empcode| lvdays| typeid| Flag| date      | reason 
-------|--------|-------|-------|-----|-----------|---------
1      |  AA    | 2     |    1  |  1  | 11-02-2020| NULL 
2      |  AA    | 3     |    1  |  1  | 02-11-2019| NULL
3      |  FF    | 4     |    1  |  1  | 23-12-2019| NULL

Here is the query i am trying to build but not able to achieve the goal .

SELECT MNGR_CODE,
       MNGR_CODE2,
       lt.desc,
       l.reason,
       l.leaveID
FROM Leave l
     INNER JOIN lvtype lt ON l.typeid = lt.typeid
     LEFT OUTER HASH JOIN employee em ON em.Emp_Code = l.empcode
WHERE empcode IN ('AA', 'FF')
  AND leaveID IN (SELECT leaveID
                  FROM Leave l
                       INNER JOIN lvtype lt ON l.typeid = lt.typeid
                  WHERE l.empcode IN ('AA', 'FF')
                  GROUP BY l.empcode
                  HAVING SUM(lvdays) > 30);

Answer 1

If I followed you correctly, you could use window functions:

select *
from (
    select 
        e.mngr_code,
        e.mngr_code2,
        lt.desc, 
        l.reason,
        l.leaveid,
        sum(l.lvdays) over(partition by e.empcode) sum_lvdays
    from leave l 
    inner join lvtype lt on l.typeid = lt.typeid 
    inner join employee em on em.emp_code = l.empcode
) t
where sum_lvdays > 30

The subquery is based on your existing query, and adds an additional column that does a window sum of all leaves of each employee. The outer query uses the results of the window sum as a filter.

I am unsure that you do need a left join in the subquery, so I changed it to an inner join.