Can anyone help me figure out this SQL Query?
I have the following table:
x
ID | Name | ManagerId
1 | Alice | 4
2 | Bob | 4
3 | Carol | 4
4 | Xavier | 5
5 | Zack | NULL
I want the new table to look like this:
ID | Name | Manager Name
1 | Alice | Xavier
2 | Bob | Xavier
3 | Carol | Xavier
4 | Xavier | Zack
5 | Zack | NULL
So essentially I want to replace the third column from “ManagerId” to “Manager Name,” where all information is retrieved in the same table.
Can anyone help me with the query?
I was thinking of something like the following, but it wasn’t even compiling:
WITH EmployeeCTE AS
(
SELECT *, ID, Name, ManagerID OVER(PARTITION BY ID ORDER BY ID)
FROM Employee
)
SELECT ID, Name, EmployeeCTE.Name as "Manager Name"
FROM EmployeesCTE
I had another attempt, but got stumped quickly:
SELECT ID, Name, ??
INNER JOIN Employee ON ID = Employee.ID
FROM Employee
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Answer
Just use a join
:
select e.*, m.name as manager_name
from employee e left join
employee m
on e.managerid = m.id