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SQL Puzzle | The NO Root Puzzle – A SINGLE Select | SQL Interview Question

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SQL Puzzle | The NO Root Puzzle – A SINGLE Select | SQL Interview Question

In this puzzle you have to find out nodes that doesn’t have root in database tree. The challenge is to do this in a single select. For more details please see the sample input and expected output.

Sample Input

PId Left Right
1 2 3
2 4 5
3 6 7
10 NULL NULL
9 8 NULL

Expected Output

PId
1
10
9

Script – DDL and INSERT Sample Data

--

CREATE TABLE TheLeftRight 
(
   PId INT NOT NULL
  ,[Left]  INT 
  ,[Right] INT 
)
GO

INSERT INTO TheLeftRight VALUES
(1,2,3),
(2,4,5),
(3,6,7),
(10,NULL,NULL),
(9,8,NULL)
GO

SELECT * FROM TheLeftRight
GO


--

SOLUTION – 1

--

SELECT T1.PId
FROM  TheLeftRight U
RIGHT JOIN TheLeftRight T1
ON (u.[Left]=T1.PId or u.[Right]=T1.PId )
WHERE u.PId IS NULL

--

OUTPUT – 1

--


PId
-----------
1
10
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.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

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

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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.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

SQL Puzzle | The Concatenation Puzzle | SQL Interview Question


SQL Puzzle | The Concatenation Puzzle | SQL Interview Question

In this puzzle you have to concat columns Nm and Val if they were not already concatenated at the beginning in Val column. For more details please see the sample input and expected output.

Sample Input

Id Nm Val
1 A 1
2 B 1
3 CC CC11
4 D 12
5 E E71
6 F F0

Expected Output

Id Nm Val NewVal
1 A 1 A1
2 B 1 B1
3 CC CC11 CC11
4 D 12 D12
5 E E71 E71
6 F F0 F0

Script – DDL and INSERT Sample Data

--

CREATE TABLE TheConcatPuzzle
(
	 Id INT
	,Nm VARCHAR(10)
	,Val VARCHAR(20)
)
GO

INSERT INTO TheConcatPuzzle VALUES
(1,'A','1'),
(2,'B','1'),
(3,'CC','CC11'),
(4,'D','12'),
(5,'E','E71'),
(6,'F','F0')
GO

SELECT * FROM TheConcatPuzzle
GO

--

SOLUTION – 1

--

SELECT *, IIF(CHARINDEX(Nm,Val)=0,CONCAT(Nm,Val),Val) NewVal FROM TheConcatPuzzle
GO

--

Output – 1

--

Id          Nm         Val                  NewVal
----------- ---------- -------------------- ------------------------------
1           A          1                    A1
2           B          1                    B1
3           CC         CC11                 CC11
4           D          12                   D12
5           E          E71                  E71
6           F          F0                   F0

(6 rows affected)


--

SOLUTION – 3

--

SELECT *,CASE WHEN SUBSTRING(val,1,LEN(nm)) = nm THEN val ELSE concat(nm,val) END NewVal
FROM TheConcatPuzzle

--

Output – 3

--

Id          Nm         Val                  NewVal
----------- ---------- -------------------- ------------------------------
1           A          1                    A1
2           B          1                    B1
3           CC         CC11                 CC11
4           D          12                   D12
5           E          E71                  E71
6           F          F0                   F0

(6 rows affected)


--

SOLUTION – 3

--

SELECT *, IIF(Val LIKE NM+'%',Val,CONCAT(Nm,Val)) NewVal
FROM TheConcatPuzzle

--

Output – 3

--

Id          Nm         Val                  NewVal
----------- ---------- -------------------- ------------------------------
1           A          1                    A1
2           B          1                    B1
3           CC         CC11                 CC11
4           D          12                   D12
5           E          E71                  E71
6           F          F0                   F0

(6 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.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

SQL Puzzle | THE 11th Hour Puzzle | SQL Interview Question

Tags

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SQL Puzzle | THE 11th Hour Puzzle | SQL Interview Question

In this puzzle you have to find out records between 11 to 12 hour of the ts column. For more details please see the sample input and expected output.

Sample Input

Id Ts
1 2013-06-19 11:39:54.130
2 2018-06-19 12:39:54.130
3 2017-06-19 11:59:59.130
4 2018-06-18 10:39:54.130
5 2018-06-18 09:39:54.130
6 2018-06-18 09:39:54.130
7 NULL

Expected Output

Id Ts
1 2013-06-19 11:39:54.130
3 2017-06-19 11:59:59.130

Script – DDL and INSERT Sample Data

--

CREATE TABLE GetRecords
(
	 Id INT
	,Ts DATETIME
)
GO

INSERT INTO GetRecords VALUES
(1,'2013-06-19 11:39:54.130'),
(2,'2018-06-19 12:39:54.130'),
(3,'2017-06-19 11:59:59.130'),
(4,'2018-06-18 10:39:54.130'),
(5,'2018-06-18 09:39:54.130'),
(6,'2018-06-18 09:39:54.130'),
(7, NULL)
GO

SELECT * FROM GetRecords
GO

--

SOLUTION – 1

--

SELECT * FROM GetRecords
WHERE DATEPART(HOUR, Ts) >= 11 AND DATEPART(HOUR, Ts) < 12

--

Output – 1

--

Id          Ts
----------- -----------------------
1           2013-06-19 11:39:54.130
3           2017-06-19 11:59:59.130

(2 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.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

SQL Puzzle | THE Multi-Array JSON Read Puzzle | SQL Interview Question

Tags

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SQL Puzzle | THE Multi-Array JSON Read Puzzle | SQL Interview Question

In this puzzle you have to read the JSON column to get Skills and Id value for each Name. Example. For more details please see the sample input and expected output.

Sample Input

Nn Val
Kishan [{“Id”:”3″,”Skills”:”mySQL SERVER”}]
Pawan [{“Id”:”1″,”Skills”:”SQL SERVER”},{“Id”:”11″,”Skills”:”Oracle”}]
Avtaar [{“Id”:”2″,”Skills”:”T-SQL”}]

Expected Output

Nm Skills Id
Kishan mySQL SERVER 3
Pawan SQL SERVER 1
Pawan Oracle 11
Avtaar T-SQL 2

Script – DDL and INSERT Sample Data

--

CREATE TABLE TheJSONS
(
	 Nn VARCHAR(10)
	,Val VARCHAR(100)
)
GO

INSERT INTO TheJSONS VALUES
('Kishan','[{"Id":"3","Skills":"mySQL SERVER"}]'),
('Pawan','[{"Id":"1","Skills":"SQL SERVER"},{"Id":"11","Skills":"Oracle"}]'),
('Avtaar','[{"Id":"2","Skills":"T-SQL"}]')
GO

SELECT * FROM TheJSONS
GO

--

SOLUTION – 1

--

SELECT Nn Nm,Skills,Id
FROM TheJSONS
CROSS APPLY
OPENJSON (Val) WITH (Id INT'$.Id',Skills VARCHAR(20) '$.Skills')

--

Output – 1

--

Nm         Skills               Id
---------- -------------------- -----------
Kishan     mySQL SERVER         3
Pawan      SQL SERVER           1
Pawan      Oracle               11
Avtaar     T-SQL                2

(4 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.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com