Question

I have a USER table structure as shown below:

id  parent_id      userName
10     01        Project manager
11     10        manager
12     11        teamlead
13     12        team member

I need to find the project manager ID if I give the team member ID in where clause. I can get the results in each individual query.

But I’m trying to implement it with a JOIN query. I’m new to JOIN queries. How do I do it?

Answer 1

I believe this should work with your existing schema

SELECT ParentUser.UserName AS ManagerName, BaseUser.UserName AS TeamMemberName 
FROM User AS BaseUser
    INNER JOIN User AS ParentUser
        ON  BaseUser.parent_id = ParentUser.id
WHERE BaseUser.Id = @PassedInTeamMemberId