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finding hierarchy info


finding hierarchy info

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evvo1961
evvo1961
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I am wanting to run a SQL statement whereby i return the ID of any employee's Director.

The database for employees has a reportsto field which enables me to see the hierarchy of managers above any employee.

There is also a IsDirector flag that indicates a director.

So essentially i want to run sql that would return the first instance of a director in the hierarchy above any employee.

eg if A reports to B and B reports to C (who is a director) then it returns C. (for A's userid)

I basically want the script to run until a director is found.

how would i do this?
Sean Lange
Sean Lange
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Hi and welcome to the forums. In order to help we will need a few things:

1. Sample DDL in the form of CREATE TABLE statements
2. Sample data in the form of INSERT INTO statements
3. Expected results based on the sample data

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What should we report back if these conditions take place:

1 - The employee in question is a director?
2 - There are several directors at the same level?

Anyway, the idea would be to traverse the hierarchy one level at a time and stop the recursive part as soon as you have found the first 'IsDirector'.

with C1 as (
select employeeid, fname, lname, IsDirector, employeeid as R, IsDirector as FoundDir
from employees
where employeeid = @employeeid
union all
select C.employeeid, C.fname, C.lname, C.IsDirector, P.R, max(IsDirector) over(partition by P.R)
from C1 as P inner join employees as C on C.ReportsTo = P.employeeid
where P.FoundDir = 0
)
select *
from C1
where IsDirector = 1;


We can adapt it after you have posted DDL and sample data.



Jeff Moden
Jeff Moden
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This sounds like the perfect task for Nested Sets. Looking forward to readily consumable sample data for this problem.

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