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Improving my SQL BI Skills

Improving my SQL BI Skills

Monthly Archives: December 2015

SQL Puzzle | The Facebook Puzzle # 2 ( Count Characters in a string Puzzle )

24 Thursday Dec 2015

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

≈ 5 Comments

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Buy SQL Server Interview Questions Book Online at Low Price, Check Prime Number puzzle, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, 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, find records not ending with s, find records not ending with s puzzle, Finding prime numbers with SQL server, Free Download SQL SERVER Interview questions, implementation and administration, Interesting Interview Questions, 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, Joins, Joins Interview questions, Joins Puzzle, Khowal, last non null puzzle, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Multiplication of Digits Puzzle, Multiply digits of a number, multiply digits of a number puzzle, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Prev Value puzzle, Previous value puzzle, Prime numbers using SQL, Program to Print prime numbers, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Records not ending with a character Puzzle, Records not ending with s Puzzle, SELECT Puzzle, Split & Count Puzzle, Split & count puzzle in SQL, Split and Count puzzle SQL Server, SQL, SQL - 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SQL Puzzle | The Facebook Puzzle # 2

Puzzle Statement

This puzzle was asked in social media ( Facebook ), Here you have a string and you have to count how many times each character appear in the string. Please check sample input and expected output.

Sample Input String

‘aaaaaabbbbbccccc’

Expected Output

Charx CharxCounts
a 6
b 5
c 5

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 | Using Simple SELECT & Numbers Table

--

DECLARE @str AS VARCHAR(100) = 'aaaaaabbbbbccccc'

SELECT SUBSTRING(@str,number,1) Charx , COUNT(SUBSTRING(@str,number,1)) CharxCounts
FROM 
( 
	SELECT DISTINCT number FROM
	MASTER..SPT_VALUES WHERE number > 0 AND number <= DATALENGTH(@str)
)v
GROUP BY SUBSTRING(@str,number,1)

--

In the above solution I am using numbers table. Add a comment if you have any other solution in mind. I would love to learn it. We all need to learn.

Enjoy !!! Keep Learning

Pawan Khowal 

Http://MSBISkills.com

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SQL Puzzle | The Facebook Puzzle # 1

22 Tuesday Dec 2015

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

≈ Leave a comment

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Buy SQL Server Interview Questions Book Online at Low Price, Check Prime Number puzzle, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, 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, find records not ending with s, find records not ending with s puzzle, Finding prime numbers with SQL server, Free Download SQL SERVER Interview questions, implementation and administration, Interesting Interview Questions, 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, Joins, Joins Interview questions, Joins Puzzle, Khowal, last non null puzzle, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Multiplication of Digits Puzzle, Multiply digits of a number, multiply digits of a number puzzle, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Prev Value puzzle, Previous value puzzle, Prime numbers using SQL, Program to Print prime numbers, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Records not ending with a character Puzzle, Records not ending with s Puzzle, SELECT Puzzle, Split & Count Puzzle, Split & count puzzle in SQL, Split and Count puzzle SQL Server, SQL, SQL - 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SQL Puzzle | The Facebook Puzzle # 1

Puzzle Statement

This puzzle was asked in social media ( Facebook ), Here you have a string and you have to insert a character(_) underscore after every third character in the string. Please check sample input and expected output.

Sample Input String

vinod kumar reddy ”k

Expected Output

vin_od _kum_ar _red_dy _’k

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 | Using Simple SELECT & Numbers Table

--

DECLARE @str AS VARCHAR(100) = 'vinod kumar reddy ''k'
DECLARE @outs AS VARCHAR(500) = ''

SELECT @outs = Concat(@outs,'',CASE WHEN number % 3 = 0 THEN CONCAT(SUBSTRING(@str,number,1) , '_') ELSE SUBSTRING(@str,number,1) END)
FROM 
( 
	SELECT DISTINCT number FROM
	MASTER..SPT_VALUES WHERE number > 0 AND number <= DATALENGTH(@str)
)v
SELECT @outs

--

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

Enjoy !!! Keep Learning

Pawan Khowal 

Http://MSBISkills.com

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SQL Puzzle | Find Different Values Puzzle

21 Monday Dec 2015

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

≈ 2 Comments

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Buy SQL Server Interview Questions Book Online at Low Price, Check Prime Number puzzle, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, 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, find records not ending with s, find records not ending with s puzzle, Finding prime numbers with SQL server, Free Download SQL SERVER Interview questions, implementation and administration, Interesting Interview Questions, 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, Joins, Joins Interview questions, Joins Puzzle, Khowal, last non null puzzle, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Multiplication of Digits Puzzle, Multiply digits of a number, multiply digits of a number puzzle, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Prev Value puzzle, Previous value puzzle, Prime numbers using SQL, Program to Print prime numbers, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Records not ending with a character Puzzle, Records not ending with s Puzzle, SELECT Puzzle, Split & Count Puzzle, Split & count puzzle in SQL, Split and Count puzzle SQL Server, SQL, SQL - 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SQL Puzzle | Find Different Values Puzzle

Puzzle Statement

In this puzzle you have to find rows where one of the column value is 1. We don’t need values where both column have values 1. Please check sample input and expected output for details. One of my old friend asks this question in all the technical interviews he used to take.

Sample Input

a b
0 1
1 2
1 1
2 3
5 3

Expected output

a b
0 1
1 2

Script

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

--

CREATE TABLE TestXOR
(
	 a SmallINT 
	,b SmallINT
)
GO


INSERT TestXOR
VALUES 
(0,1),
(1,2),
(1,1),
(2,3),
(5,3)
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

SOLUTION 1 | Using Simple SELECT

--

SELECT a,b FROM TestXOR
WHERE ( a = 1 AND b != 1 ) OR ( a != 1 AND b = 1 )

--

SOLUTION 2 | Using XOR Operator & Case

--

SELECT a,b FROM TestXOR
WHERE (CASE WHEN a = 1 THEN 1 ELSE 0 END) ^ 
	  ( CASE WHEN b = 1 THEN 1 ELSE 0 END ) = 1

--

SOLUTION 3 | Using Case Trick

--

SELECT a,b FROM TestXOR
WHERE (CASE WHEN a = 1 THEN 1 ELSE 0 END) +
	  ( CASE WHEN b = 1 THEN 1 ELSE 0 END ) = 1

--

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

Enjoy !!! Keep Learning

Pawan Khowal 

Http://MSBISkills.com

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SQL Puzzle | Get Weeks (Start Date – End Date) for a Month & Year

18 Friday Dec 2015

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

≈ 2 Comments

Tags

Advanced SQL Interview Questions and Answers, Advanced SQL tutorial pdf, any recommended websites for sql puzzles, Buy SQL Server Interview Questions Book Online at Low Price, Check Prime Number puzzle, COmples tSQL puzzles, Complex SQL Challenges, complex sql statement(puzzle), Complex tsql, Complex TSQL Challenge, 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, find records not ending with s, find records not ending with s puzzle, Finding prime numbers with SQL server, Free Download SQL SERVER Interview questions, implementation and administration, Interesting Interview Questions, 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, Joins, Joins Interview questions, Joins Puzzle, Khowal, last non null puzzle, Learn complex SQL, Learn SQL, Learn T-SQL, Microsoft SQL Server interview questions for DBA, MS SQL Server interview questions, MSBI Interview Questions, Multiplication of Digits Puzzle, Multiply digits of a number, multiply digits of a number puzzle, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, Prev Value puzzle, Previous value puzzle, Prime numbers using SQL, Program to Print prime numbers, Puzzle SQL, puzzle sql developer, Puzzle SQl Server, Puzzles, PUzzles in SQL SERVER, Queries for SQL Interview, Records not ending with a character Puzzle, Records not ending with s Puzzle, SELECT Puzzle, Split & Count Puzzle, Split & count puzzle in SQL, Split and Count puzzle SQL Server, SQL, SQL - The Pattern Puzzles, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Extreme Difficult Puzzle, SQL FAQ, SQL FAQs, 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 | 2nd Highest Salary in Each Department using OffSet & Fetch Method, SQL Puzzle | Get Weeks (Start Date - End Date) for a Month & Year, SQL Puzzle | Multiplication of Digits Puzzle, SQL Puzzle | Star Pattern Puzzle ( Fun with SQL ), SQL Puzzle | The Middle 4 Puzzle, SQL Puzzle | The Time Difference 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 Questions, SQL Quiz, SQL Server - Common Interview Questions and Answers, 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 Indexes, SQL Server Interview Puzzle, SQL SERVER Interview questions, SQL SERVER Interview questions & Answers, SQL Server Interview Questions - 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SQL Puzzle | Get Weeks (Start Date – End Date) for a particular month & year

Puzzle Statement

Recently I was asked by a developer how we can find weeks of a particular month and year. Say you want to find out weeks for December month for 2015 year.

Rules
1. Week starts from a Sunday and ends on a Saturday
2. First week start date should be first day of the month
3. Last week end date should be last day of the month

Sample Input

Month = 12 i.e. December
Year = 2015

Expected output

WeekStart WeekEnd
01-12-2015 06-12-2015
07-12-2015 13-12-2015
14-12-2015 20-12-2015
21-12-2015 27-12-2015
28-12-2015 31-12-2015

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 #

--


DECLARE @Mon AS INT = 12 , @Year AS INT = 2015
;WITH CTE AS
(
     SELECT DISTINCT number, DATEFROMPARTS(@Year,@Mon,Number) Dt
     ,DATEADD(d, (8 - datepart(WEEKDAY, DATEFROMPARTS(@Year,@Mon,Number))), DATEFROMPARTS(@Year,@Mon,Number)) Wk
     FROM
           MASTER..SPT_Values
     WHERE
          Number > 0 AND number < DAY(EOMONTH(CONCAT(@Year,'/',@Mon,'/','01'))) ),
          CTE1 AS ( SELECT CASE WHEN number = 1 THEN DATEADD(d,-1,Dt) ELSE Dt End Dt 
          ,CASE WHEN Wk > EOMONTH(dt) THEN EOMONTH(dt) ELSE WK END Wk 		 
	 FROM CTE
)
SELECT MIN(DATEADD(d,1,Dt)) WeekStart , Wk WeekEnd FROM CTE1
GROUP BY Wk
ORDER BY WeekStart

--

Add a comment if you have any other solution in mind. I would love to learn it.

We all need to learn.

Enjoy !!! Keep Learning

Pawan Kumar Khowal 

Http://MSBISkills.com

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502 SQL Puzzles with answers

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