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SQL Puzzle | The Next AND The Previous Puzzle | SQL Interview Question

In this puzzle you have given an input value and based on that value you have to find out the previous and next row. For more details please see the sample input and expected output.

Sample Input

Id PreviousVals CurrentVals
1 11 15
2 15 31
3 31 9
4 27 12
5 12 11

Expected Output

Id PreviousVals CurrentVals
1 11 15
2 15 31
3 31 9

Script – DDL and INSERT Sample Data

--

CREATE TABLE TheNextAndPreviousPuzzle
(
	 Id INT
	,PreviousVals int
	,CurrentVals int	
)
GO

INSERT INTO TheNextAndPreviousPuzzle VALUES
(1,11,15),
(2,15,31),
(3,31,9),
(4,27,12),
(5,12,11)
GO

SELECT * FROM TheNextAndPreviousPuzzle
GO

--

SOLUTION – 1

--


SELECT DISTINCT T.* FROM TheNextAndPreviousPuzzle t inner join TheNextAndPreviousPuzzle t1 on 
(((t.CurrentVals = t1.PreviousVals) OR (t1.CurrentVals = t.PreviousVals))  AND t1.CurrentVals = 31) 
OR t.CurrentVals = 31

--

OUTPUT – 1

--


Id          PreviousVals CurrentVals
----------- ------------ -----------
1           11           15
2           15           31
3           31           9

(3 rows affected)

--

Enjoy 🙂

Please add comment(s) if you have one or multiple solutions in mind. Thank You.

Pawan Khowal

Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.

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