How to merge values of a row to two columns in sql

Question

Table 1

ID  Employee ID
1   200678
2   3000033
3   4454545
4   2323232
5   43345563
6   8473434
7   234234
8   766566

Table 2

ID  year    Manger id
1   2015    8
1   2014    7
2   2015    5
2   2014    6
3   2015    5
3   2014    4
4   2015    1
4   2014    2

Output

ID  Current year Manger ID  Prev Manager id
1   766566                  234234
2   43345563                8473434

Answer 1

In SQL-Server you can do something like this:

SAMPLE DATA

---

CREATE TABLE #Table1
(
ID INT,
[Employee ID] INT
)
INSERT INTO #Table1 VALUES
(1,   200678   ),
(2,   3000033  ),
(3,   4454545  ),
(4,   2323232  ),
(5,   43345563 ),
(6,   8473434  ),
(7,   234234   ),
(8,   766566   )

CREATE TABLE #Table2
(
ID  INT,
years NVARCHAR(100),   
[Manger id] INT
)
INSERT INTO #Table2 VALUES
(1,   '2015',    8),
(1,   '2014',    7),
(2,   '2015',    5),
(2,   '2014',    6),
(3,   '2015',    5),
(3,   '2014',    4),
(4,   '2015',    1),
(4,   '2014',    2)

---

QUERY

SELECT t2.ID, 
       MAX(CASE WHEN years = YEAR(GETDATE()) THEN [Employee ID] END) AS [Current year Manger ID],
       MIN(CASE WHEN years = YEAR(GETDATE())-1 THEN [Employee ID] END) AS [Prev Manager id]
FROM #Table1 t1
JOIN #Table2 t2 ON t1.ID = t2.[Manger id]
GROUP BY t2.ID

---

OUTPUT

ID  Current year Manger ID  Prev Manager id
1   766566                  234234
2   43345563                8473434
3   43345563                2323232
4   200678                  3000033

---

DEMO

You can test It at: SQL FIDDLE