Max sal to print base on manager_id - sql

Question

I have this table:
id mgr_id sal
1 5 5000
2 5 6000
3 6 7000
4 6 8000
I expect this output:
id mgr_id sal MaX_sal
1 5 5000 6000
2 5 6000 6000
3 6 7000 8000
4 6 8000 8000
Based on mgr_id select max sal and print in front of id.
Thanks in advance.

Answer 1

Possible would be a subselect inside the select (although a bit slow as all subselects are):
select id, mgr_id, sal, (select max(sal) from mytable n2
where n2.mgr_id = mytable.mgr_id) as max_sal from mytable

Answer 2

Create a subtable grouping by mrg_id to get the max Sal per mrg_id and then left join it with the principal table on mrg_id -- Try this :
declare #table table (id int,mrg_id int,sal decimal(10,0))
insert into #table
select 1, 5, 5000 union all
select 2, 5, 6000 union all
select 3, 6, 7000 union all
select 4, 6, 8000
/***** change #table with your table name *****/
SELECT
t.id,
t.mrg_id,
t.sal,
t1.max_sal
FROM #table t
LEFT JOIN
(SELECT
mrg_id,
MAX(sal) max_sal
FROM #table
group by
mrg_id) t1
on t.mrg_id=t1.mrg_id

Answer 3

This would work even in SQL Server 6.5
SELECT id, mgr_id, sal,
(
SELECT MAX(sal)
FROM employees mgr
WHERE mgr.mgr_id = emp.mgr_id
) AS max_sal
FROM
employees emp
This works on SQL Server 2005:
WITH max_sals AS
(
SELECT mgr_id, MAX(sal) AS max_sal
FROM employees
GROUP BY mgr_id
)
SELECT emp.*, max_sals.max_sal
FROM
employees emp
LEFT JOIN max_sals
ON emp.mgr_id = max_sals.mgr_id
and this using partiton:
SELECT emp.*, MAX(emp.sal) OVER (PARTITION BY emp.mgr_id) AS max_sal
FROM employees emp
Sample data and table:
CREATE TABLE employees
(
id int,
mgr_id int,
sal int
)
INSERT INTO employees VALUES
(1,5,5000),
(2,5,6000),
(3,6,7000),
(4,6,8000)

Answer 4

With SQL Server 2012 simply use this query:
SELECT d.id, d.mgr_id, d.sal, MAX(sal) over(partition by mgr_id)
FROM #data d
You can use this query with SQL Server <2012:
SELECT d.id, d.mgr_id, d.sal, m.mx
FROM #data d
INNER JOIN (
SELECT mgr_id, mx = MAX(sal) FROM #data
GROUP BY mgr_id
) m
ON m.mgr_id = d.mgr_id;
Another option with SQL Server >= 2005:
SELECT d.id, d.mgr_id, d.sal, m.mx
FROM #data d
CROSS APPLY (SELECT mx = MAX(sal) FROM #data m WHERE m.mgr_id = d.mgr_id) m(mx)
Sample data:
Declare #data table([id] int, [mgr_id] int, [sal] int);
INSERT INTO #data([id], [mgr_id], [sal])
VALUES
(1, 5, 5000),
(2, 5, 6000),
(3, 6, 7000),
(4, 6, 8000)
;

Answer 5

Try Cross Apply,
SELECT id,
mgr_id,
sal,
Max_sal
FROM #your_table A
CROSS APPLY (SELECT Max(SAL) AS Max_sal
FROM #your_table B
WHERE B.mgr_id = A.mgr_id)cs