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T-SQL Query | [Finding Next Value Puzzle] – Write a query which will extract the next value from the currentQuota for each row.

Sample Input

BusinessEntityID SalesYear CurrentQuota
275 2005 367000
275 2005 556000
275 2006 502000
275 2006 550000
275 2006 1429000
275 2006 1324000

Expected Output

BusinessEntityID SalesYear CurrentQuota NextCurrentData
275 2005 367000 556000
275 2005 556000 502000
275 2006 502000 550000
275 2006 550000 1429000
275 2006 1429000 1324000
275 2006 1324000 0

Rules/Restrictions

  • The solution should be should use “SELECT” statement or “CTE”.
  • Send your solution to pawankkmr@gmail.com
  • Do not post you solution in comments section

Script Use the below script to generate the source table and fill them up with the sample data.


--Create table

CREATE TABLE lag
(
 BusinessEntityID INT
,SalesYear   INT
,CurrentQuota DECIMAL(20,4)
)

GO

--Insert Data
INSERT INTO lag
SELECT 275 , 2005 , '367000.00'
UNION ALL
SELECT 275 , 2005 , '556000.00'
UNION ALL
SELECT 275 , 2006 , '502000.00'
UNION ALL
SELECT 275 , 2006 , '550000.00'
UNION ALL
SELECT 275 , 2006 , '1429000.00'
UNION ALL
SELECT 275 , 2006 ,   '1324000.00'

--Check data
SELECT BusinessEntityID,SalesYear,CurrentQuota FROM lag

Update May 14 | Solutions



--


---------------------------------------
--Sol 1 | Pawan Kumar Khowal
---------------------------------------


;WITH CTE AS
(
	SELECT BusinessEntityID,SalesYear,CurrentQuota,ROW_NUMBER() OVER (ORDER BY %%Physloc%%) rnk	 
	FROM lag
)
SELECT    BusinessEntityID,SalesYear,CurrentQuota
		, ISNULL(( SELECT TOP 1 CurrentQuota FROM CTE c2 WHERE c1.rnk < c2.rnk ),0) NextCurrentData
FROM CTE c1


---------------------------------------
--Sol 2 | Pawan Kumar Khowal
---------------------------------------


;WITH CTE AS
(
	SELECT BusinessEntityID,SalesYear,CurrentQuota,ROW_NUMBER() OVER (ORDER BY %%Physloc%%) rnk	 
	FROM lag
)
SELECT    BusinessEntityID,SalesYear,CurrentQuota
		  ,ISNULL(LEAD(CurrentQuota) OVER (ORDER BY rnk),0) NextCurrentData		
FROM CTE c1


--

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