Check the below input data and expected output to divide employee table into three partitions basis on salary ranges.

Input Data:

EmpId       EmpName    Salary
----------- ---------- -----------
1           abc        10000
2           xyz        20000
3           bcd        40000
4           rtf        30000
5           qwe        45000
6           tyu        65000
7           fgh        52000
8           dfc        35000
9           asd        45000
10          xcv        52000
11          olp        65000
12          lmj        25000
13          vbn        20000
14          efe        10000

Expected Output:

NumberOfPartitions   SalaryRanges              Counts
-------------------- ------------------------- -----------
1                    10000-25000               5
2                    30000-45000               5
3                    52000-65000               4

Create a table with data:

CREATE TABLE tbl_Emp
(
     EmpId INT
    ,EmpName VARCHAR(10)
    ,Salary INT
)
GO
 
INSERT INTO tbl_Emp
VALUES
(1,'abc',10000),
(2,'xyz',20000),
(3,'bcd',40000),
(4,'rtf',30000),
(5,'qwe',45000),
(6,'tyu',65000),
(7,'fgh',52000),
(8,'dfc',35000),
(9,'asd',45000),
(10,'xcv',52000),
(11,'olp',65000),
(12,'lmj',25000),
(13,'vbn',20000),
(14,'efe',10000)
GO

Solution: Using NTILE()

;WITH CTE AS
(
	SELECT
		Salary
		,NTILE(3) OVER (ORDER BY Salary) as NumberOfPartitions
	FROM tbl_Emp
)
SELECT 
	NumberOfPartitions
	,CONCAT(MIN(Salary),'-',MAX(Salary)) SalaryRanges
	,COUNT(*) Counts
FROM CTE
GROUP BY NumberOfPartitions

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