Get result from Multiple Select statement on a single Query - sql

Question

I'm trying to create a stored procedure that will display the result of users managed by a manager. I have tried to use CTE but still was unsuccessful.
What I want,
The first query to select the row whose user name = #name
Second query: return users that are managed by (first query ManagerId)
Third query: return all users that are managed by each (second query ManagerId)
This is the structure of the data:
SQL query:
WITH EmployeeCTE AS
(
(SELECT UserId, Email, ManagerId, Name
FROM Table1
WHERE DisplayName LIKE '%Paul%') tbl1
(SELECT UserId, Email, ManagerId, Name
FROM Table1
WHERE ManagerId = tbl1.UserId) tbl2
(SELECT UserId, Email, ManagerId, Name
FROM Table1
WHERE ManagerId = tbl1.UserId) tbl3
)
--Lastly
SELECT *
FROM EmployeeCTE
Please help anyone.

Answer 1

You just simply need a proper recursive CTE - something like this:
WITH EmployeeCTE AS
(
-- "anchor" for the query
SELECT
UserId, Email, ManagerId, Name,
[Level] = 1
FROM
dbo.Table1
WHERE
Name LIKE '%Paul%'
-- I would personally probably use this condition instead
-- ManagerId IS NULL
UNION ALL
-- recursive part
SELECT
t1.UserId, t1.Email, t1.ManagerId, t1.Name,
e.[Level] + 1
FROM
dbo.Table1 t1
INNER JOIN
EmployeeCTE e ON t1.ManagerId = e.UserId
)
SELECT *
FROM EmployeeCTE
This selects the "anchor" row (or rows), and then "recurses" the manager/employee relationship based on Employee.ManagerId = Manager.UserId. I've also added the Level column so you see on which level (of the hierarchy) each entry is located - the "anchor" will be level 1, each further level down is incremented by 1.
PS: if you need to limit the returned data set to the root level + max. of 2 levels down, you can use the Level column to do so in your final SELECT that selects from the CTE:
WITH EmployeeCTE AS
(
--- as above
)
SELECT *
FROM EmployeeCTE
WHERE [Level] <= 3 -- select root level (1) and max. of 2 levels down