SQL Puzzle | Multiple Ways to READ XML DATA using SQL

21 Wednesday Feb 2018

Posted by Pawan Kumar Khowal in SQL Puzzles, SQL SERVER, SQL Server Interview Questions, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

≈ 7 Comments

Tags

SQL Puzzle | Multiple Ways to READ XML DATA using SQL

In this puzzle you have to read XML using T-SQL

Please check the sample input and the expected output.

Sample Input


<Items>
    <Item>        
        <Id>1</Id>
        <Name>Pawan</Name>        
        <Date>2018/01/01</Date>
    </Item>
    <Item>        
        <Id>2</Id>
        <Name>Avtaar</Name>        
        <Date>2018/01/11</Date>
    </Item>
    <Item>        
        <Id>3</Id>
        <Name>Kishan</Name>        
        <Date>2018/01/20</Date>
    </Item>
</Items>

Expected Output

Id	Name	Date
1	Pawan	2018-01-01 00:00:00.000
2	Avtaar	2018-01-11 00:00:00.000
3	Kishan	2018-01-20 00:00:00.000

Use below script to create table and insert sample data into it.

--

DECLARE @XML AS XML = 
'<Items>
    <Item>        
        <Id>1</Id>
        <Name>Pawan</Name>        
        <Date>2018/01/01</Date>
    </Item>
    <Item>        
        <Id>2</Id>
        <Name>Avtaar</Name>        
        <Date>2018/01/11</Date>
    </Item>
    <Item>        
        <Id>3</Id>
        <Name>Kishan</Name>        
        <Date>2018/01/20</Date>
    </Item>
</Items>'

--

Rules/Restrictions

The solution should be should use “SELECT” statement or “CTE”.

Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com

SOLUTION – 1

--


DECLARE @XML AS XML = 
'<Items>
    <Item>        
        <Id>1</Id>
        <Name>Pawan</Name>        
        <Date>2018/01/01</Date>
    </Item>
    <Item>        
        <Id>2</Id>
        <Name>Avtaar</Name>        
        <Date>2018/01/11</Date>
    </Item>
    <Item>        
        <Id>3</Id>
        <Name>Kishan</Name>        
        <Date>2018/01/20</Date>
    </Item>
</Items>    
'

DECLARE @m TABLE  (Xmls XML)
INSERT INTO @m SELECT @XML 
;WITH CTE AS
(
    SELECT p.value(N'(Id/text())[1]',N'nvarchar(10)') AS [Id]
          ,p.value(N'(Name/text())[1]',N'nvarchar(20)') AS [Name]
          ,p.value(N'(Date/text())[1]',N'nvarchar(20)') AS [Dt]          
    FROM @m as x
    OUTER APPLY x.Xmls.nodes(N'/Items/Item') AS u(p)
)
SELECT * 
FROM CTE
ORDER BY Dt DESC

--

Output-1

--                            

Id          Name                      Date
----------- ------------------------- -----------------------
1           Pawan                     2018-01-01 00:00:00.000
2           Avtaar                    2018-01-11 00:00:00.000
3           Kishan                    2018-01-20 00:00:00.000

(3 rows affected)

--

SOLUTION – 2

--


DECLARE @XML AS XML = 

'<Items>
    <Item>        
        <Id>1</Id>
        <Name>Pawan</Name>        
        <Date>2018/01/01</Date>
    </Item>
    <Item>        
        <Id>2</Id>
        <Name>Avtaar</Name>        
        <Date>2018/01/11</Date>
    </Item>
    <Item>        
        <Id>3</Id>
        <Name>Kishan</Name>        
        <Date>2018/01/20</Date>
    </Item>
</Items>'
 
DECLARE @m TABLE  (Xmls XML)
INSERT INTO @m SELECT @XML 

SELECT
       Xmls.value('(//Id)[1]', 'INT') AS 'Id'
	  ,Xmls.value('(//Name)[1]', 'VARCHAR(25)') AS 'Name'
	  ,Xmls.value('(//Date)[1]', 'DATE') AS 'Date'	  	 
FROM @m
UNION ALL
SELECT
       Xmls.value('(//Id)[2]', 'INT') AS 'Id'
	  ,Xmls.value('(//Name)[2]', 'VARCHAR(25)') AS 'Name'
	  ,Xmls.value('(//Date)[2]', 'DATETIME') AS 'Date'	  	 
FROM @m
UNION ALL
SELECT
       Xmls.value('(//Id)[3]', 'INT') AS 'Id'
	  ,Xmls.value('(//Name)[3]', 'VARCHAR(25)') AS 'Name'
	  ,Xmls.value('(//Date)[3]', 'DATETIME') AS 'Date'	  	 
FROM @m

--

Output-2

--                            

Id          Name                      Date
----------- ------------------------- -----------------------
1           Pawan                     2018-01-01 00:00:00.000
2           Avtaar                    2018-01-11 00:00:00.000
3           Kishan                    2018-01-20 00:00:00.000

(3 rows affected)

--

SOLUTION – 3

--

DECLARE @XML AS XML = '
<Items>
    <Item>        
        <Id>1</Id>
        <Name>Pawan</Name>        
        <Date>2018/01/01</Date>
    </Item>
    <Item>        
        <Id>2</Id>
        <Name>Avtaar</Name>        
        <Date>2018/01/11</Date>
    </Item>
    <Item>        
        <Id>3</Id>
        <Name>Kishan</Name>        
        <Date>2018/01/20</Date>
    </Item>
</Items>'
 
SELECT
       T.N.value('Id[1]', 'INT') AS 'Id'
	  ,T.N.value('Name[1]', 'VARCHAR(25)') AS 'Name'
	  ,T.N.value('Date[1]', 'DATE') AS 'Date'	  	 
FROM @XML.nodes('/Items/Item') T(N)  	 


--

Output-3

--                            

Id          Name                      Date
----------- ------------------------- ----------
1           Pawan                     2018-01-01
2           Avtaar                    2018-01-11
3           Kishan                    2018-01-20

(3 rows affected)

--

Related XML Puzzles

1	https://msbiskills.com/2018/02/20/sql-puzzle-handling-special-characters-with-for-xml-path-puzzle/
2	https://msbiskills.com/2018/02/18/sql-puzzle-get-latest-record-from-xml/
3	https://msbiskills.com/2018/01/19/sql-puzzle-split-string-via-on-dot-using-xml/
4	https://msbiskills.com/2017/12/15/sql-puzzle-generate-xml-puzzle/
5	https://msbiskills.com/2017/10/27/sql-puzzle-the-xml-node-copy-puzzle/
6	https://msbiskills.com/2017/10/18/sql-puzzle-the-xml-explicit-puzzle/
7	https://msbiskills.com/2016/11/28/sql-puzzle-the-xml-path-puzzle/
8	https://pawankkmr.wordpress.com/2015/03/25/t-sql-query-group-by-xml-path-puzzle/
9	https://pawankkmr.wordpress.com/2015/03/25/t-sql-query-covert-comma-separated-values-to-a-table-using-cross-apply-xml-puzzle/

Add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn.

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/

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SQL Puzzle | The TWIN MAX Puzzle | SQL Interview Question – Can you provide a better solution?

21 Wednesday Feb 2018

Posted by Pawan Kumar Khowal in SQL Puzzles, SQL SERVER, SQL Server Interview Questions, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

≈ 8 Comments

Tags

SQL Puzzle | The TWIN MAX Puzzle | SQL Interview Question

In this puzzle you have to find records where you have maximum salary and maximum experience. Both the condition should be met to fetch the rows.

Please check the sample input and the expected output.

Sample Input

EmpId	Nm	Salary	Experience
1	Pawan	5000	11
2	Avtaar	1000	10
3	Kishan	5000	9
4	Ishu	1000	7
5	Nika	4500	11
6	Vaibhav	5000	5

Expected Output

EmpId	Nm	Experience	Salary
1	Pawan	11	5000

Use below script to create table and insert sample data into it.

--

CREATE TABLE TheMaximumsPuzzle
(
	 EmpId INT
	,Nm VARCHAR(10)
	,Salary INT
	,Experience INT
)
GO

INSERT INTO TheMaximumsPuzzle VALUES
(1,'Pawan',5000,11),
(2,'Avtaar',1000,10),
(3,'Kishan',5000,9),
(4,'Ishu',1000,7),
(5,'Nika',4500,11),
(6,'Vaibhav',5000,5)
GO

SELECT * FROM TheMaximumsPuzzle
GO

--

Rules/Restrictions

The solution should be should use “SELECT” statement or “CTE”.

Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com

1 SOLUTION

SOLUTION – 1

--

SELECT k.EmpId,k.Nm,k.Experience,k.Salary
FROM
(
	SELECT * , MAX(experience) OVER() a , MAX(Salary) OVER() b
	FROM TheMaximumsPuzzle
)k WHERE Salary = b AND Experience = a


--

Output-1

--                            

EmpId       Nm         Experience  Salary
----------- ---------- ----------- -----------
1           Pawan      11          5000

(1 row affected)

--

SOLUTION – 2 | old School Solution

--

SELECT k.EmpId,k.Nm,k.Experience,k.Salary
FROM TheMaximumsPuzzle k
CROSS APPLY
(
	SELECT MAX(experience) a , MAX(Salary) b
	FROM TheMaximumsPuzzle
)z WHERE Salary = b AND Experience = a

--

Output-2

--                            

EmpId       Nm         Experience  Salary
----------- ---------- ----------- -----------
1           Pawan      11          5000

(1 row affected)


--

Please add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn. Thanks in advance.

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:
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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 | Strings containing 3 consecutive numbers in increasing order Puzzle?

21 Wednesday Feb 2018

Posted by Pawan Kumar Khowal in SQL Puzzles, SQL SERVER, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

≈ 4 Comments

Tags

SQL Puzzle | Strings containing 3 consecutive numbers in increasing order Puzzle | SQL Interview Question

In this puzzle you have to find strings which contains number sequences. E.g. If you have a string like ‘1231786’ so in this string you have 123 in sequence so we need this row in the output otherwise we will exclude that row from the output. Also note that we will only have string of numbers only. Alphanumeric characters will not be there.

Please check the sample input and the expected output.

Sample Input

Vals
1234
1112
1
1034
NULL

Expected Output

VALS
1234

Use below script to create table and insert sample data into it.

--

CREATE TABLE CONSECUTIVE
(
	Vals VARCHAR(100)
)
GO

INSERT INTO CONSECUTIVE VALUES
(1234),
(1112),
(1),
(1034),
(NULL)
GO

SELECT * FROM CONSECUTIVE
GO


--

Rules/Restrictions

The solution should be should use “SELECT” statement or “CTE”.

Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com

1 SOLUTION

SOLUTION – 1

--

/* In this solution we have created a new table called [pos] where we 
are storing all the combinations of 3 digits in consecutive numbers 
in increasing order*/

CREATE TABLE [dbo].[pos]
(
       [opt] [int] NULL
) 
GO

INSERT [dbo].[pos] ([opt]) VALUES (123)
GO
INSERT [dbo].[pos] ([opt]) VALUES (234)
GO
INSERT [dbo].[pos] ([opt]) VALUES (345)
GO
INSERT [dbo].[pos] ([opt]) VALUES (456)
GO
INSERT [dbo].[pos] ([opt]) VALUES (567)
GO
INSERT [dbo].[pos] ([opt]) VALUES (678)
GO
INSERT [dbo].[pos] ([opt]) VALUES (789)
GO

/*After that we just have to JOIN this table with the input table to match the things*/


SELECT VALS from consecutive  c
CROSS JOIN pos 
WHERE CHARINDEX(CAST(opt AS VARCHAR(50)),vals) > 0 
GROUP BY VALS

--

Output-1

--                            

VALS
---------------- 
1234

(1 row affected)

--

SOLUTION – 2 | Using Recursion – Solution BY Ashu S

--

;With cte as 
(
	select vals as a, vals as b from consecutive
	union all
	select a, SUBSTRING(b,2,len(b)-1) from cte
	where len(b)>3
)
select distinct a 
from cte where cast(cast(b as int)- cast (replicate(substring(b,1,1),len(b)) as int) 
as varchar(max)) like '12%'

--

Output-2

--                            

a
------------------ 
1234

(1 row affected)

--

Add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn.

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

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SQL Puzzle | DISTINCT Count with NULL Puzzle – A SINGLE SELECT? | SQL Interview Question

21 Wednesday Feb 2018

Posted by Pawan Kumar Khowal in SQL Puzzles, SQL SERVER, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

≈ 2 Comments

Tags

SQL Puzzle | DISTINCT Count with NULL Puzzle – A single SELECT? | SQL Interview Question

In this puzzle you have to distinct records for each Id. The challege here is to do that in a single select. The other condition is that we need to consider NULL while considering distinct records. This is one of my Favorite interview question. Don’t know why it was not published earlier.

Please check the sample input and the expected output.

Can you do this in a single select ?

Sample Input

Id	Vals
1	a
1	NULL
2	b
2	b
2	b
2	c
2	NULL
3	NULL
3	NULL
4	a
4	a
4	a

Expected Output

Id	DistinctCount
1	2
2	3
3	1
4	1

Use below script to create table and insert sample data into it.

--

CREATE TABLE GetUniqueCountwithNULLs
(
	 Id INT
	,Vals VARCHAR(100)
)
GO

INSERT INTO GetUniqueCountwithNULLs VALUES
(1,'a'),
(1,NULL),
(2,'b'),
(2,'b'),
(2,'b'),
(2,'c'),
(2,NULL),
(3,NULL),
(3,NULL),
(4,'a'),
(4,'a'),
(4,'a')
GO

SELECT * FROM GetUniqueCountwithNULLs
GO

--

Rules/Restrictions

The solution should be should use “SELECT” statement or “CTE”.

Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com

4 SOLUTIONS

SOLUTION – 1 | A SINGLE SELECT Solution

--

SELECT Id , COUNT(DISTINCT Vals) + MAX(CASE WHEN Vals IS NULL THEN 1 ELSE 0 END)  DistinctCount
FROM GetUniqueCountwithNULLs
GROUP BY Id 

--

Output-1

--                            


Id          DistinctCount
----------- -------------
1           2
2           3
3           1
4           1


(4 rows affected)



--

SOLUTION – 2 | A SINGLE SELECT Solution – Solution BY Vikas G

--

SELECT Id , COUNT(DISTINCT IIF(Vals IS NULL,'a',Vals+' a')) DistinctCount
FROM GetUniqueCountwithNULLs
GROUP BY Id


--

Output-2

--                            


Id          DistinctCount
----------- -------------
1           2
2           3
3           1
4           1


(4 rows affected)



--

SOLUTION – 3 | TWO SELECT SOLUTION with ROW_Number()

--

;WITH CTE AS 
(
	SELECT *, ROW_NUMBER() OVER (PARTITION BY id,vals ORDER BY vals) AS RN FROM GetUniqueCountwithNULLs 
)
SELECT Id, COUNT(*) DistinctCount from cte 
WHERE RN=1 
GROUP BY ID 

--

Output-3

--                            


Id          DistinctCount
----------- -------------
1           2
2           3
3           1
4           1


(4 rows affected)



--

SOLUTION – 4 | TWO SELECT SOLUTION with Group By

--

SELECT ID, COUNT(DISTINCT Vals) , (COUNT(*) - COUNT(vals)) DistinctCount
FROM
(
	SELECT ID,Vals FROM GetUniqueCountwithNULLs 
	GROUP BY ID,VALS
)a 
GROUP By ID
GO 

--

Output-4

--                            


Id          DistinctCount
----------- -------------
1           2
2           3
3           1
4           1


(4 rows affected)



--

Related Puzzles

1	https://msbiskills.com/2018/02/16/sql-puzzle-the-amazing-null-problem-sql-interview-question/
2	https://pawankkmr.wordpress.com/2012/07/24/t-sql-6/
3	https://pawankkmr.wordpress.com/2015/03/31/t-sql-query-group-by-remove-null-uom-puzzle/
4	https://pawankkmr.wordpress.com/2015/04/02/t-sql-query-count-null-values-puzzle/
5	https://pawankkmr.wordpress.com/2015/05/10/t-sql-query-the-previous-valuenon-null-puzzle/
6	https://msbiskills.com/2015/08/06/t-sql-query-the-remove-nulls-puzzle/
7	https://msbiskills.com/2016/02/07/sql-puzzle-the-remove-null-puzzle/
8	https://msbiskills.com/2016/05/18/sql-puzzle-the-null-columns-puzzle/
9	https://msbiskills.com/2016/07/26/sql-puzzle-remove-nulls-via-row-wise-pattern/
10	https://msbiskills.com/2017/02/15/sql-puzzle-the-isnull-puzzle/
11	https://msbiskills.com/2017/12/26/sql-puzzle-the-tricky-null-puzzle-1/
12	https://msbiskills.com/2017/12/26/sql-puzzle-the-tricky-null-puzzle-2concat/
13	https://msbiskills.com/2018/02/08/sql-puzzle-get-isnull-isnull-next-non-null-value-previous-non-null-value-0-puzzle/

Add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn.

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:
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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

Improving my SQL BI Skills

Daily Archives: February 21, 2018

SQL Puzzle | Multiple Ways to READ XML DATA using SQL

SQL Puzzle | The TWIN MAX Puzzle | SQL Interview Question – Can you provide a better solution?

SQL Puzzle | Strings containing 3 consecutive numbers in increasing order Puzzle?

SQL Puzzle | DISTINCT Count with NULL Puzzle – A SINGLE SELECT? | SQL Interview Question

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