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Improving my SQL BI Skills

Improving my SQL BI Skills

Daily Archives: April 30, 2018

Data Interview Question | What is a Data hub ?

30 Monday Apr 2018

Posted by Pawan Kumar Khowal in Data, Data warehousing, Download SQL Interview Q's, SQL SERVER, SQL Server Interview Questions

≈ Leave a comment


Data Interview Question | What is a Data hub ?

Hello Friends, Last month I recieved an email from one of my reader saying why you are not write on data related questions. I replied saying that I shall start soon. Today is a very good day to start the data related question. I shall also cover the BIG Data as well as data warehousing question. Now the category I am using these kind of questions as data interview questions. So today lets start with the data hub.

What is a data hub?-

A data hub basically is a collection of data (consider this as Big Data Management) from multiple sources. It uses a Hadoop platform as the central data repository. The idea of an data hub is to provide an organization with a centralized data source that can quickly provide users with the information they need.

The data distribution normally happens in the form of a hub and spoke architecture. The spoke-hub distribution paradigm is a form of transport topology optimization in which traffic routes are organized as a series of ‘spokes’ that connect outlying points to a central ‘hub.’

Enterprise data hubs are designed to address the challenge of data that is ballooning in volume, variety and velocity (3Vs). This term is largely associated with Cloudera and MapR.

Data Hub notes-
1. Data from all the sources data is moved to one place.
2. Data is (at least partially) harmonized as it is moved.
3. Data is indexed in the harmonized form for efficient access and analysis.

Data hubs products avaible are-

1. Apache Hadoop
2. Avoiding Mass Extinctions Engine
3. CKAN
4. DataHub
5. DataMarket
6. Dataverse
7. DSpace
8. MarkLogic
9. OpenDataSoft
10. Quandl
11. QuickCode
12. Socrata

References-

https://en.wikipedia.org/wiki/Data_hub
https://en.wikipedia.org/wiki/Spoke%E2%80%93hub_distribution_paradigm
https://searchcio.techtarget.com/definition/enterprise-data-hub
https://www.marklogic.com/blog/data-lakes-data-hubs-federation-one-best/

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

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SQL PUZZLE ( SQL 2016 ) | Remove all JSON elements BUT first | Advanced SQL

30 Monday Apr 2018

Posted by Pawan Kumar Khowal in Download SQL Interview Q's, SQL Concepts, SQL Puzzles, SQL SERVER, SQL Server Interview Questions, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

≈ Leave a comment

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Best SQL Puzzles, Buy SQL Server Interview Questions Book Online at Low Price, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, convert string to proper case in sql server, Divide rows into two columns, Download SQL Questions, Download SQL Server Interview Question in PDF, Download SQL SERVER Interview questions, Download SQL Server Interview questions and answers, download sql server interview questions and answers pdf, download sql server interview questions by Pawan Khowal, download sql server interview questions by Pawan Kumar, download sql server interview questions by Pawan Kumar Khowal, Download T-SQL Interview Questions, Free Download SQL SERVER Interview questions, Get Next Value Puzzle, Huge blank areas in database field, Improve SQL Skills, Interview Puzzles in SQL Server, Interview Qs.SQL SERVER Questions, Interview questions and Answers for MS SQL Server designing, Interview Questions and Answers For SQL, Interview questions on Joins, Interview Questions on SQL, Interview SQL Puzzles, InterviewQuestions, InterviewQuestions for SQL, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Remove Huge Multiple Spaces from a DB Fields, Remove Multiple Spaces from a DB Fields, Separate Int and char from a string column, Single Quote update SQL, SQL, SQL - The Pattern Puzzles, SQL 2012, SQL 2014, SQL 2014 Interview Questions, sql brain teasers, SQL Challenge, SQL Challenges, SQL Extreme Difficult Puzzle, SQL FAQ, SQL FAQs, sql group by only rows which are in sequence, SQL Interview Q & A, SQL Interview Questions, SQL Interview Questions - Part 2, SQL Interview Questions for SQL Professionals‎, SQL Joins, SQL Pattern Puzzles, SQL pl/sql puzzles, SQL prime number puzzle, SQL puzzle, SQL PUZZLE | Remove all JSON elements BUT first | Advanced SQL, SQL Puzzles, sql puzzles & answers, sql puzzles and answers free download, sql puzzles and answers pdf, sql puzzles for interview, sql puzzles oracle, SQL Queries, SQL Queries asked in interviews, SQL QUERY PUZZLES, SQL Query to Find Nth Highest Salary of Employee, SQL Questions, SQL Quiz, SQL Replace Puzzle, SQL Server - Common Interview Questions and Answers, SQL SERVER - Find Nth Highest Salary of Employee, SQL Server - General Interview Questions and Answers, sql server 2008 interview questions, SQL Server 2008 Interview Questions and Answers, SQL Server Database, SQL Server database developer interview questions and answers, sql server dba interview questions, SQL Server developer Interview questions and answers, SQL Server developer Interview questions with answers, SQL Server Developer T-SQL Interview Questions, SQL server filter index with LIKE and RIGHT function?, SQL Server Interview Puzzle, SQL SERVER Interview questions, SQL SERVER Interview questions & Answers, SQL Server Interview Questions - Part 1, SQL Server Interview questions and answers, SQL Server Interview Questions and Answers - Free PDF, SQL SERVER Interview questions and answers for experienced, sql server interview questions and answers for net developers, SQL Server Interview Questions And Answers.pdf, sql server interview questions by Pawan Khowal sql interview questions, SQL SERVER Interview questions pdf, SQL Server Interview Questions | MSBISKILLS.Com, SQL Server Interview Questions | MSBISKILLS.com Top 50 SQL Server Questions & Answers, SQL Server Interview Questions/Answers Part-1, SQL Server Puzzle, SQL SERVER Puzzles, SQL server Questions and Answers, SQL SERVER Tips, SQL Skills, SQL Sudoku, sql teasers, SQL Tips & Tricks, SQL Tips and Tricks, SQL Top clause, SQL Tough Puzzle, SQL Tricks, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLBI Interview Questions, SQLSERVER, SUM of grouped COUNT in SQL Query, T SQL Puzzles, T-SQL Challenge, T-SQL Interview Questions | SQL Server Interviews and Jobs, T-SQL Puzzle, T-SQL Server Interview Questions, t-sql teasers, T-SQL Tricky Puzzles, The Status Puzzle, Top 10 Frequently Asked SQL Query Interview Questions, TOP 100 SQL SERVER INTERVIEW QUESTIONS QUERIES, Top 50 SQL Server Interview Question for Testers, Tough SQL Challenges, Tough SQL Puzzles, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzle, TSQL Puzzles, TSQL Queries, tsql teasers, Update/Delete JSON array value in SQL Server


SQL PUZZLE | Remove all JSON elements BUT first | Advanced SQL

In this puzzle you have to delete all values from the JSON array but first. Please see the sample input and expected output.

Sample Input

(No column name)
{“a”:[1,2,3,4,5,6]}

Expected Output

JSON_F52E2B61-18A1-11d1-B105-00805F49916B
{“a”:[1]}

Script – DDL and INSERT Sample Data

--

DECLARE @jsonstr NVARCHAR(MAX) = '{"a":[1,2,3,4,5,6]}'

--

SOLUTION – 1

--

DECLARE @jsonstr NVARCHAR(MAX) = '{"a":[1,2,3,4,5,6]}'

;WITH CTE AS 
(
  SELECT * FROM OPENJSON(@jsonstr, '$.a')
)
SELECT JSON_QUERY( CONCAT ( '[',STRING_AGG([Value],',') WITHIN GROUP (ORDER BY [key]) ,']') ,'$') a
FROM CTE
WHERE [key] = 0
FOR JSON AUTO, WITHOUT_ARRAY_WRAPPER
GO

--

Output – 1

--

JSON_F52E2B61-18A1-11d1-B105-00805F49916B
------------------------------------------------------
{"a":[1]}

(1 row 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 | Round the Vals value to Next whole Number | Advanced SQL

30 Monday Apr 2018

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

≈ 3 Comments

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Best SQL Puzzles, Buy SQL Server Interview Questions Book Online at Low Price, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, convert string to proper case in sql server, Divide rows into two columns, Download SQL Questions, Download SQL Server Interview Question in PDF, Download SQL SERVER Interview questions, Download SQL Server Interview questions and answers, download sql server interview questions and answers pdf, download sql server interview questions by Pawan Khowal, download sql server interview questions by Pawan Kumar, download sql server interview questions by Pawan Kumar Khowal, Download T-SQL Interview Questions, Free Download SQL SERVER Interview questions, Get Next Value Puzzle, Huge blank areas in database field, Improve SQL Skills, Interview Puzzles in SQL Server, Interview Qs.SQL SERVER Questions, Interview questions and Answers for MS SQL Server designing, Interview Questions and Answers For SQL, Interview questions on Joins, Interview Questions on SQL, Interview SQL Puzzles, InterviewQuestions, InterviewQuestions for SQL, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Remove Huge Multiple Spaces from a DB Fields, Remove Multiple Spaces from a DB Fields, RoundFunctionSQL Up to nearest 10, Separate Int and char from a string column, Single Quote update SQL, SQL, SQL - The Pattern Puzzles, SQL 2012, SQL 2014, SQL 2014 Interview Questions, sql brain teasers, SQL Challenge, SQL Challenges, SQL Extreme Difficult Puzzle, SQL FAQ, SQL FAQs, sql group by only rows which are in sequence, SQL Interview Q & A, SQL Interview Questions, SQL Interview Questions - Part 2, SQL Interview Questions for SQL Professionals‎, SQL Joins, SQL Pattern Puzzles, SQL pl/sql puzzles, SQL prime number puzzle, SQL puzzle, SQL PUZZLE | Round the Vals value to Closest 10 value | Advanced SQL, SQL Puzzles, sql puzzles & answers, sql puzzles and answers free download, sql puzzles and answers pdf, sql puzzles for interview, sql puzzles oracle, SQL Queries, SQL Queries asked in interviews, SQL QUERY PUZZLES, SQL Query to Find Nth Highest Salary of Employee, SQL Questions, SQL Quiz, SQL Replace Puzzle, SQL Server - Common Interview Questions and Answers, SQL SERVER - Find Nth Highest Salary of Employee, SQL Server - General Interview Questions and Answers, sql server 2008 interview questions, SQL Server 2008 Interview Questions and Answers, SQL Server Database, SQL Server database developer interview questions and answers, sql server dba interview questions, SQL Server developer Interview questions and answers, SQL Server developer Interview questions with answers, SQL Server Developer T-SQL Interview Questions, SQL server filter index with LIKE and RIGHT function?, SQL Server Interview Puzzle, SQL SERVER Interview questions, SQL SERVER Interview questions & Answers, SQL Server Interview Questions - Part 1, SQL Server Interview questions and answers, SQL Server Interview Questions and Answers - Free PDF, SQL SERVER Interview questions and answers for experienced, sql server interview questions and answers for net developers, SQL Server Interview Questions And Answers.pdf, sql server interview questions by Pawan Khowal sql interview questions, SQL SERVER Interview questions pdf, SQL Server Interview Questions | MSBISKILLS.Com, SQL Server Interview Questions | MSBISKILLS.com Top 50 SQL Server Questions & Answers, SQL Server Interview Questions/Answers Part-1, SQL Server Puzzle, SQL SERVER Puzzles, SQL server Questions and Answers, SQL SERVER Tips, SQL Skills, SQL Sudoku, sql teasers, SQL Tips & Tricks, SQL Tips and Tricks, SQL Top clause, SQL Tough Puzzle, SQL Tricks, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLBI Interview Questions, SQLSERVER, SUM of grouped COUNT in SQL Query, T SQL Puzzles, T-SQL Challenge, T-SQL Interview Questions | SQL Server Interviews and Jobs, T-SQL Puzzle, T-SQL Server Interview Questions, t-sql teasers, T-SQL Tricky Puzzles, The Status Puzzle, Top 10 Frequently Asked SQL Query Interview Questions, TOP 100 SQL SERVER INTERVIEW QUESTIONS QUERIES, Top 50 SQL Server Interview Question for Testers, Tough SQL Challenges, Tough SQL Puzzles, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzle, TSQL Puzzles, TSQL Queries, tsql teasers


SQL PUZZLE | Round the Vals value to Closest 10 value | Advanced SQL

In this puzzle you have to read the column – vals and round the integer to the closest next whole number. Please see the sample input and expected output.

Sample Input

Id Vals
1 40
2 41
3 42
4 43
5 44
6 45
7 46
8 47
9 48
10 49
11 50

Expected Output

Id Vals CloseToNextTen
1 40 40
2 41 50
3 42 50
4 43 50
5 44 50
6 45 50
7 46 50
8 47 50
9 48 50
10 49 50
11 50 50

Script – DDL and INSERT Sample Data

--

CREATE TABLE CloseTen
(
	 Id INT
	,Vals INT
)
GO

INSERT INTO CloseTen VALUES
(1,40),
(2,41),
(3,42),
(4,43),
(5,44),
(6,45),
(7,46),
(8,47),
(9,48),
(10,49),
(11,50)
GO

SELECT * FROM CloseTen
GO

--

SOLUTION – 1

--

SELECT * , ((Vals + 9)/ 10) * 10 CloseToNextTen
FROM CloseTen

--

Output – 1

--

Id          Vals        CloseToNextTen
----------- ----------- --------------
1           40          40
2           41          50
3           42          50
4           43          50
5           44          50
6           45          50
7           46          50
8           47          50
9           48          50
10          49          50
11          50          50

(11 rows affected)

--

SOLUTION – 2

--

SELECT * , (((Vals - 1) / 10) + 1) * 10  CloseToNextTen
FROM CloseTen

--

Output – 2

--

Id          Vals        CloseToNextTen
----------- ----------- --------------
1           40          40
2           41          50
3           42          50
4           43          50
5           44          50
6           45          50
7           46          50
8           47          50
9           48          50
10          49          50
11          50          50

(11 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

Share this

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SQL PUZZLE | The ONLY type PUZZLE | One of my BEST SQL Interview Question

30 Monday Apr 2018

Posted by Pawan Kumar Khowal in Download SQL Interview Q's, SQL Concepts, SQL Puzzles, SQL SERVER, SQL Server Interview Questions, SQL SERVER Puzzles, T SQL Puzzles, Tricky SQL Queries

≈ 3 Comments

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Best SQL Puzzles, Buy SQL Server Interview Questions Book Online at Low Price, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, convert string to proper case in sql server, Divide rows into two columns, Download SQL Questions, Download SQL Server Interview Question in PDF, Download SQL SERVER Interview questions, Download SQL Server Interview questions and answers, download sql server interview questions and answers pdf, download sql server interview questions by Pawan Khowal, download sql server interview questions by Pawan Kumar, download sql server interview questions by Pawan Kumar Khowal, Download T-SQL Interview Questions, Free Download SQL SERVER Interview questions, Get Next Value Puzzle, Huge blank areas in database field, Improve SQL Skills, Interview Puzzles in SQL Server, Interview Qs.SQL SERVER Questions, Interview questions and Answers for MS SQL Server designing, Interview Questions and Answers For SQL, Interview questions on Joins, Interview Questions on SQL, Interview SQL Puzzles, InterviewQuestions, InterviewQuestions for SQL, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Remove Huge Multiple Spaces from a DB Fields, Remove Multiple Spaces from a DB Fields, Separate Int and char from a string column, Single Quote update SQL, SQL, SQL - The Pattern Puzzles, SQL 2012, SQL 2014, SQL 2014 Interview Questions, sql brain teasers, SQL Challenge, SQL Challenges, SQL Extreme Difficult Puzzle, SQL FAQ, SQL FAQs, sql group by only rows which are in sequence, SQL Interview Q & A, SQL Interview Questions, SQL Interview Questions - Part 2, SQL Interview Questions for SQL Professionals‎, SQL Joins, SQL Pattern Puzzles, SQL pl/sql puzzles, SQL prime number puzzle, SQL puzzle, SQL Puzzles, sql puzzles & answers, sql puzzles and answers free download, sql puzzles and answers pdf, sql puzzles for interview, sql puzzles oracle, SQL Queries, SQL Queries asked in interviews, SQL QUERY PUZZLES, SQL Query to Find Nth Highest Salary of Employee, SQL Questions, SQL Quiz, SQL Replace Puzzle, SQL Server - Common Interview Questions and Answers, SQL SERVER - Find Nth Highest Salary of Employee, SQL Server - General Interview Questions and Answers, sql server 2008 interview questions, SQL Server 2008 Interview Questions and Answers, SQL Server Database, SQL Server database developer interview questions and answers, sql server dba interview questions, SQL Server developer Interview questions and answers, SQL Server developer Interview questions with answers, SQL Server Developer T-SQL Interview Questions, SQL server filter index with LIKE and RIGHT function?, SQL Server Interview Puzzle, SQL SERVER Interview questions, SQL SERVER Interview questions & Answers, SQL Server Interview Questions - Part 1, SQL Server Interview questions and answers, SQL Server Interview Questions and Answers - Free PDF, SQL SERVER Interview questions and answers for experienced, sql server interview questions and answers for net developers, SQL Server Interview Questions And Answers.pdf, sql server interview questions by Pawan Khowal sql interview questions, SQL SERVER Interview questions pdf, SQL Server Interview Questions | MSBISKILLS.Com, SQL Server Interview Questions | MSBISKILLS.com Top 50 SQL Server Questions & Answers, SQL Server Interview Questions/Answers Part-1, SQL Server Puzzle, SQL SERVER Puzzles, SQL server Questions and Answers, SQL SERVER Tips, SQL Skills, SQL Sudoku, sql teasers, SQL Tips & Tricks, SQL Tips and Tricks, SQL Top clause, SQL Tough Puzzle, SQL Tricks, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLBI Interview Questions, SQLSERVER, SUM of grouped COUNT in SQL Query, T SQL Puzzles, T-SQL Challenge, T-SQL Interview Questions | SQL Server Interviews and Jobs, T-SQL Puzzle, T-SQL Server Interview Questions, t-sql teasers, T-SQL Tricky Puzzles, The Status Puzzle, Top 10 Frequently Asked SQL Query Interview Questions, TOP 100 SQL SERVER INTERVIEW QUESTIONS QUERIES, Top 50 SQL Server Interview Question for Testers, Tough SQL Challenges, Tough SQL Puzzles, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzle, TSQL Puzzles, TSQL Queries, tsql teasers


SQL PUZZLE | The ONLY type PUZZLE – One of my BEST SQL Interview Question

This is one of my best interview question for 5 years plus experience people. In this you have to find out rows where for each Id you have only one type of Type that is 21. In the sample you should get 2 and 4 rows as output. Please see the sample input and expected output.

Sample Input

Id Type Vals
1 3 900.00
1 3 200.00
1 3 800.00
1 21 200.00
2 21 100.00
2 21 100.00
3 3 100.00
3 3 100.00
4 21 100.00

Expected Output

Id Type Vals
2 21 100.00
2 21 100.00
4 21 100.00

Script – DDL and INSERT Sample Data

--

CREATE TABLE OnlyOneType
(
	 Id INT
	,[Type] INT
	,Vals DECIMAL(10,2)
)
GO

INSERT INTO OnlyOneType VALUES
(1,3 ,900.00 ),
(1,3 ,200.00 ),
(1,3 ,800.00 ),
(1,21,200.00 ),
(2,21,100.00  ),
(2,21,100.00  ),
(3,3 ,100.00 ),
(3,3 ,100.00 ),
(4,21,100.00)
GO

SELECT * FROM OnlyOneType T
GO

--

SOLUTION – 1

--

SELECT * FROM OnlyOneType T
WHERE [Type] = 21
AND NOT EXISTS ( SELECT NULL FROM OnlyOneType T1 WHERE T1.Id = T.Id and T1.Type <> 21 )


--

Output – 1

--

Id          Type        Vals
----------- ----------- ---------------------------------------
2           21          100.00
2           21          100.00
4           21          100.00

(3 rows affected)

--

SOLUTION – 2

--

SELECT Id,Type,Vals
FROM 
(
	SELECT *
	, COUNT(*) OVER(PARTITION BY Id) a 
	, SUM(CASE WHEN [Type]=21 THEN 1 ELSE 0 END) OVER(PARTITION BY Id) b 
	FROM OnlyOneType T
)x WHERE a = b

--

Output – 2

--

Id          Type        Vals
----------- ----------- ---------------------------------------
2           21          100.00
2           21          100.00
4           21          100.00

(3 rows affected)

--

SOLUTION – 3

--

SELECT T.* FROM OnlyOneType T
JOIN
(
	SELECT ID from OnlyOneType 
	GROUP BY ID having COUNT(DIstinct type) = 1 AND MAX([type]) = 21 
)x ON x.Id = T.Id

--

Output – 3

--

Id          Type        Vals
----------- ----------- ---------------------------------------
2           21          100.00
2           21          100.00
4           21          100.00

(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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502 SQL Puzzles with answers

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The big day is here. Finally presented 500+ puzzles for SQL community.

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