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Improving my SQL BI Skills

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Tag Archives: SELECT

T-SQL Output Query | [ The JOIN Puzzle – Part 4 ( Join with an Empty Set ) ]

15 Tuesday Sep 2015

Posted by Pawan Kumar Khowal in Tricky SQL Queries

≈ 2 Comments

Tags

A puzzle, A quick query puzzle, A SQL Puzzle, A SQL Server Puzzle, Complex SQL Challenges, complex sql statement(puzzle), Complex TSQL Challenge, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions on Joins, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Join SQL Server tables where columns include NULL values, Joins, Joins Interview questions, Joins Puzzle, Khowal, Learn complex SQL, Learn SQL, Learn T-SQL, NULLs and JOINs, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, puzzle sql developer, Puzzles, Puzzles in SQL, PUzzles in SQL SERVER, Queries for SQL Interview, SELECT, SELECT Puzzle, SELECT SUM returns a row when there are no records, Some useful SQL puzzles to teach SQL, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL puzzle, SQL Puzzles, SQL Queries, SQL QUERY PUZZLES, SQL Quiz, SQL Server - Best way to Handle NULLS in Joins, SQL Server Database, SQL SERVER Interview questions, SQL Server Puzzle, SQL SERVER Puzzles, SQL Server: joining NULL values, SQL Skills, SQL Sudoku, SQL Top clause, SQL Tricky Puzzles, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, The Biggest Gap Puzzle, The Gap Puzzle, The GroupBy Puzzle, Tough SQL Challenges, Tough SQL Puzzles, Tricky Puzzles in SQL, tricky puzzles in SQL Server, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzles, TSQL Queries, TSQLPuzzles, Week puzzle


T-SQL Output Query | [ The JOIN Puzzle – Part 4 ( Join with an Empty Set ) ]

–Let’s say we have 2 table TestJoins5 and TestJoins6. Both the tables having only one ID column. Here you have to provide the output of the queries given below. Before that please go through the input data below.

Update – Added Outputs below – 17 Sep 2015

Pawan Kumar Khowal - Join Table 1

Pawan Kumar Khowal – Join Table 1

Pawan Kumar Khowal - Join Table 2

Pawan Kumar Khowal – Join Table 2


--

CREATE TABLE TestJoins5
(
	ID INT 
)
GO

INSERT INTO TestJoins5 VALUES (NULL),(NULL)
GO

CREATE TABLE TestJoins6
(
	ID INT 
)
GO

--Query 1
SELECT t1.ID , t2.ID FROM [dbo].[TestJoins5] t1 INNER JOIN [dbo].[TestJoins6] t2  ON t1.ID = t2.ID
 
--Query 2
SELECT t1.ID , t2.ID FROM [dbo].[TestJoins5] t1 LEFT OUTER JOIN [dbo].[TestJoins6] t2  ON t1.ID = t2.ID
 
--Query 3
SELECT t1.ID , t2.ID FROM [dbo].[TestJoins5] t1 RIGHT OUTER JOIN [dbo].[TestJoins6] t2  ON t1.ID = t2.ID
 
--Query 4
SELECT t1.ID , t2.ID FROM [dbo].[TestJoins5] t1 FULL OUTER JOIN [dbo].[TestJoins6] t2  ON t1.ID = t2.ID

--Query 5
SELECT t1.ID , t2.ID FROM [dbo].[TestJoins5] t1 CROSS JOIN [dbo].[TestJoins6] t2

--

Output of the above puzzles is given below-

Pawan Khowal - Join Outputs

Pawan Khowal – Join Outputs

Please leave a comment if you need solution to the above puzzle

Keep Learning

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A SQL Puzzle | What is the SUM & Count of an Empty Table?

15 Tuesday Sep 2015

Posted by Pawan Kumar Khowal in Download SQL Interview Q's, SQL Performance Tuning, SQL Server Interview Questions, Tricky SQL Queries

≈ 2 Comments

Tags

A puzzle, A quick query puzzle, A SQL Puzzle, A SQL Server Puzzle, Complex SQL Challenges, complex sql statement(puzzle), Complex TSQL Challenge, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions on Joins, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Join SQL Server tables where columns include NULL values, Joins, Joins Interview questions, Joins Puzzle, Khowal, Learn complex SQL, Learn SQL, Learn T-SQL, NULLs and JOINs, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, puzzle sql developer, Puzzles, Puzzles in SQL, PUzzles in SQL SERVER, Queries for SQL Interview, SELECT, SELECT Puzzle, SELECT SUM returns a row when there are no records, Some useful SQL puzzles to teach SQL, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL puzzle, SQL Puzzles, SQL Queries, SQL QUERY PUZZLES, SQL Quiz, SQL Server - Best way to Handle NULLS in Joins, SQL Server Database, SQL SERVER Interview questions, SQL Server Puzzle, SQL SERVER Puzzles, SQL Server: joining NULL values, SQL Skills, SQL Sudoku, SQL Top clause, SQL Tricky Puzzles, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, The Biggest Gap Puzzle, The Gap Puzzle, The GroupBy Puzzle, Tough SQL Challenges, Tough SQL Puzzles, Tricky Puzzles in SQL, tricky puzzles in SQL Server, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzles, TSQL Queries, TSQLPuzzles, Week puzzle, What is the SUM of an Empty Table?, Why does ANSI SQL define SUM(no rows) as NULL?, Why does SUM(…) on an empty recordset return NULL instead of 0?


A SQL Puzzle | What is the SUM and Count of an Empty Table?

Let’s start by creating some sample data.

--

CREATE TABLE testEmpty
(
	ID INT
)
GO

SELECT SUM(ID) Sums FROM testEmpty
SELECT COUNT(*) Cnts FROM testEmpty

CREATE TABLE testEmpty1
(
	ID INT NOT NULL
)
GO

SELECT COUNT(*) Cnts FROM testEmpty1
SELECT SUM(ID) Sums FROM testEmpty1

--

If you run the above statements for both the tables, What will be the sum value and the Count value for the above queries and their reasons ?

Please add answers in the comments section !

Cheers, Keep Learning !!

Pawan Kumar Khowal

MSBISKills.com

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SQL Server – Best way to Handle NULLS in Joins

15 Tuesday Sep 2015

Posted by Pawan Kumar Khowal in Download SQL Interview Q's, SQL Performance Tuning, SQL Server Interview Questions, Tricky SQL Queries

≈ Leave a comment

Tags

A puzzle, A quick query puzzle, A SQL Puzzle, A SQL Server Puzzle, Complex SQL Challenges, complex sql statement(puzzle), Complex TSQL Challenge, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions on Joins, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Join SQL Server tables where columns include NULL values, Joins, Joins Interview questions, Joins Puzzle, Khowal, Learn complex SQL, Learn SQL, Learn T-SQL, NULLs and JOINs, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, puzzle sql developer, Puzzles, Puzzles in SQL, PUzzles in SQL SERVER, Queries for SQL Interview, SELECT, SELECT Puzzle, Some useful SQL puzzles to teach SQL, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL puzzle, SQL Puzzles, SQL Queries, SQL QUERY PUZZLES, SQL Quiz, SQL Server - Best way to Handle NULLS in Joins, SQL Server Database, SQL SERVER Interview questions, SQL Server Puzzle, SQL SERVER Puzzles, SQL Server: joining NULL values, SQL Skills, SQL Sudoku, SQL Top clause, SQL Tricky Puzzles, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, The Biggest Gap Puzzle, The Gap Puzzle, The GroupBy Puzzle, Tough SQL Challenges, Tough SQL Puzzles, Tricky Puzzles in SQL, tricky puzzles in SQL Server, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzles, TSQL Queries, TSQLPuzzles, Week puzzle


SQL Server – Best way to Handle NULLS in Joins

Well today we will talk about how to handle null values while joining tables, especially in case of inner joins when you want them to match. If you see online there some methods given but none of them mentioned which one is the best. It actually depends on the kind of query and the kind of data you have in your tables. I will show you some methods you can use to join null values while joining tables.

Let’s create some sample data.

--

CREATE TABLE testJoinswithNULLs1
(
	ID INT 
)
GO

INSERT INTO testJoinswithNULLs1 VALUES ( NULL )

CREATE CLUSTERED INDEX Ix_Id ON testJoinswithNULLs1(ID) 

CREATE TABLE testJoinswithNULLs2
(
	ID INT 
)
GO

INSERT INTO testJoinswithNULLs2 VALUES ( NULL )
GO 1000

INSERT INTO testJoinswithNULLs2 VALUES (1),(2),(3),(4),(5)

CREATE CLUSTERED INDEX Ix_Id ON testJoinswithNULLs2(ID)

--

Here both the tables have clustered keys associated with it. In first table we have a single null value and in the second table we have 1000 null values.

Method 1. Use of ISNULL function – Here we just capturing the NULL value using ISNULL() function @ run-time and replacing it by -1, -1 is just and example, You can use any value you want. The value you select should not be present in the table you are joining.

--

SELECT 
	a.ID , b.ID 
FROM 
	testJoinswithNULLs1 a INNER JOIN testJoinswithNULLs2 b
	ON ISNULL(a.ID,-1) = ISNULL(b.ID,-1)
GO

--

Method 2. Use of COALESCE function – Here we just capturing the NULL value using COALESCE() function @ run-time and replacing it by -1, -1 is just and example, You can use any value you want. The value you select should not be present in the table you are joining.

--


SELECT 
	a.ID , b.ID 
FROM 
	testJoinswithNULLs1 a INNER JOIN testJoinswithNULLs2 b
	ON COALESCE(a.ID,-1) = COALESCE(b.ID,-1)
GO

--

Method 3. Check for NULL while Joining – Here we are checking for NULL Values using OR condition

--

SELECT 
	a.ID , b.ID 
FROM 
	testJoinswithNULLs1 a INNER JOIN testJoinswithNULLs2 b
	ON a.ID = a.ID OR (a.ID IS NULL AND b.ID IS NULL)
GO

--

Now let’s check out the execution plans for all the three methods.

Pawan Khowal - Nulls & Joins

Pawan Khowal – Nulls & Joins

Now I know that the statistics are up to date, hence we can trust the cost. It is clearly evident that the last method is the best one we have. So choose wisely.:)

Cheers, Thanks for reading !

-Pawan Khowal

MSBISkills.com

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A SQL Puzzle | The String & Null Puzzle

13 Sunday Sep 2015

Posted by Pawan Kumar Khowal in Tricky SQL Queries

≈ Leave a comment

Tags

A puzzle, A quick query puzzle, A SQL Puzzle, A SQL Server Puzzle, Complex SQL Challenges, complex sql statement(puzzle), Complex TSQL Challenge, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions on Joins, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Joins, Joins Interview questions, Joins Puzzle, Khowal, Learn complex SQL, Learn SQL, Learn T-SQL, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, puzzle sql developer, Puzzles, Puzzles in SQL, PUzzles in SQL SERVER, Queries for SQL Interview, SELECT, SELECT Puzzle, Some useful SQL puzzles to teach SQL, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL puzzle, SQL Puzzles, SQL Queries, SQL QUERY PUZZLES, SQL Quiz, SQL Server Database, SQL SERVER Interview questions, SQL Server Puzzle, SQL SERVER Puzzles, SQL Skills, SQL Sudoku, SQL Top clause, SQL Tricky Puzzles, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, The Biggest Gap Puzzle, The Gap Puzzle, The GroupBy Puzzle, Tough SQL Challenges, Tough SQL Puzzles, Tricky Puzzles in SQL, tricky puzzles in SQL Server, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzles, TSQL Queries, TSQLPuzzles, Week puzzle


T-SQL Output Query | [ The String & Null Puzzle ]

Please go through the sample queries involved substring and reasons behind the outputs and errors..

--

DECLARE @str AS VARCHAR(50)

SET @str = 'Pawan Kumar - A Developer'

SELECT SUBSTRING(@str, NULL, 5 )

--O/P - NULL
--If you provide null in place of starting location , it will return NULL.


SELECT SUBSTRING(@str, -1, 5 )

--O/P - Paw
--Here we are starting from -1, So it will skip -1,0 location and Start from first location till 3rd position since we don't have characters at those locations

SELECT SUBSTRING(@str, 6, 5 )

--O/P -  Kuma
--Here we are starting from -1, So it will Start from 6th location and will pick 5 characters

SELECT SUBSTRING(@str, NULL, NULL )

--O/P - NULL
--If everything is NULL, then it will return NULL 🙂

SELECT SUBSTRING(@str, 0, 5 )

--O/P - Pawa
--Here we are starting from 0, So will Start from first location till 5th position will pick 4 characters only.

SELECT SUBSTRING(@str, NULL, -1 )

--O/P
Msg 536, Level 16, State 1, Line 11
Invalid length parameter passed to the substring function.

--

Cheers, Keep Learning !!

Pawan Kumar Khowal

MSBISKills.com

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A SQL Puzzle | The Computed Column Puzzle

13 Sunday Sep 2015

Posted by Pawan Kumar Khowal in Tricky SQL Queries

≈ Leave a comment

Tags

A puzzle, A quick query puzzle, A SQL Puzzle, A SQL Server Puzzle, Complex SQL Challenges, complex sql statement(puzzle), Complex TSQL Challenge, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions on Joins, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Joins, Joins Interview questions, Joins Puzzle, Khowal, Learn complex SQL, Learn SQL, Learn T-SQL, Objective Puzzle, Pawan, Pawan Khowal, Pawan Kumar, Pawan Kumar Khowal, PL/SQL Challenges, puzzle sql developer, Puzzles, Puzzles in SQL, PUzzles in SQL SERVER, Queries for SQL Interview, SELECT, SELECT Puzzle, Some useful SQL puzzles to teach SQL, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL puzzle, SQL Puzzles, SQL Queries, SQL QUERY PUZZLES, SQL Quiz, SQL Server Database, SQL SERVER Interview questions, SQL Server Puzzle, SQL SERVER Puzzles, SQL Skills, SQL Sudoku, SQL Top clause, SQL Tricky Puzzles, SQL Trikcy question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, The Biggest Gap Puzzle, The Gap Puzzle, The GroupBy Puzzle, Tough SQL Challenges, Tough SQL Puzzles, Tricky Puzzles in SQL, tricky puzzles in SQL Server, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Puzzles, TSQL Queries, TSQLPuzzles, Week puzzle


T-SQL Output Query | The Computed Column Puzzle

Recently I was implementing something in my project with computed column. From there this question comes to my mind. So here is the question. Let’s say you are doing some calculation on current year basis. Now what will happen next year means when the system dates change. Check out the example below-

--

--Consider the table definition
CREATE TABLE testCalculateColumn
(
	 ID SMALLINT
	,NumberOfYears SMALLINT
	,StartingYear AS YEAR(GETDATE()) - NumberOfYears
)
GO

--

Here Starting year is the computed column which is dependent of NumberOfYears and the current year. Now NumberOfYear will be static once we inserted any row, or it will only change if we update any value, But YEAR(GETDATE())can change every year based on your system date. Now let’s insert values into the table.

--

--Insert some values
INSERT INTO testCalculateColumn
VALUES (1,2),(1,8),(1,12),(1,1),(1,5)
GO

--

Now let’s run the select command to check the values of Starting Year

--

SELECT 
	ID,NumberOfYears, StartingYear
FROM
	testCalculateColumn;
GO


--

Output when Year = 2015

ID NumberOfYears StartingYear
1 2 2013
1 8 2007
1 12 2003
1 1 2014
1 5 2010

Today the year is 2015, Now what will happen next year when you system year = 2016. Are values of Starting year will change or will remain the same?

You have fill the below table when system year changes from 2015 to 2016-

ID NumberOfYears StartingYear
1 2  ?
1 8  ?
1 12  ?
1 1  ?
1 5  ?

Please leave a comment if you need solution to the above puzzle ! Cheers

Keep Learning

Pawan Kumar Khowal

MSBISKills.com

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