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Philip Schultz
11,437 Points
Why does UNION ALL work in this case and not just UNION

Posted May 13, 2018 1:10pm by Philip Schultz

Philip Schultz
11,437 Points
2 Answers
Ahmed Mohamed Fouad
11,735 Points
SQL Playground - Set Operations Practice (second question)

Posted May 10, 2018 9:01pm by Ahmed Mohamed Fouad

Ahmed Mohamed Fouad
11,735 Points
7 Answers
Ahmed Mohamed Fouad
11,735 Points
A technical problem with the Challenge task 2 of 5

Posted May 8, 2018 9:53pm by Ahmed Mohamed Fouad

Ahmed Mohamed Fouad
11,735 Points
3 Answers
Sean Flanagan
33,235 Points
Book count

Posted April 17, 2018 5:43pm by Sean Flanagan

Sean Flanagan
33,235 Points
1 Answer
Sean Flanagan
33,235 Points
Task 2

Posted April 12, 2018 7:43pm by Sean Flanagan

Sean Flanagan
33,235 Points
1 Answer
Sean Flanagan
33,235 Points
Task 1

Posted April 12, 2018 7:29pm by Sean Flanagan

Sean Flanagan
33,235 Points
2 Answers
Claudio Paladini
13,403 Points
How is this different from a join?

Posted April 4, 2018 3:05pm by Claudio Paladini

Claudio Paladini
13,403 Points
1 Answer
Welden Bringhurst
1,564 Points
Several questions are incorrect/poorly worded

Posted February 27, 2018 8:56pm by Welden Bringhurst

Welden Bringhurst
1,564 Points
1 Answer
Abdullah Jassim
4,551 Points
Why does the GROUP BY Function in SQL add more names. It isnt just suppose to cluster together rows together?

Posted February 6, 2018 6:37am by Abdullah Jassim

Abdullah Jassim
4,551 Points
1 Answer
Mehiret Abdissa
415 Points
Inner Join

Posted January 26, 2018 7:02pm by Mehiret Abdissa

Mehiret Abdissa
415 Points
1 Answer
Donnie Driskell
2,243 Points
Relational Data Bases PlayGround Challenge: books north and south

Posted December 28, 2017 12:56am by Donnie Driskell

Donnie Driskell
2,243 Points
4 Answers
Nate Baker
17,247 Points
How is a subquery different than a WHERE clause?

Posted December 13, 2017 7:27pm by Nate Baker

Nate Baker
17,247 Points
1 Answer
yalın küçük
4,810 Points
“SQL-99 Complete, Really”, by Peter Guzman & Trudy Pelzer

Posted December 3, 2017 5:21pm by yalın küçük

yalın küçük
4,810 Points
0 Answers
Angel Avendaño
5,013 Points
Count the total of rows in the result query when UNION is present

Posted November 18, 2017 6:32am by Angel Avendaño

Angel Avendaño
5,013 Points
1 Answer
James Kruk
1,600 Points
Is there a way to access solutions for the 'Review and Practice' challenges in the 'Launch SQL Playgrounds'?

Posted October 30, 2017 9:40pm by James Kruk

James Kruk
1,600 Points
2 Answers
Boban Talevski
24,793 Points
Is there a way to write the query as shown in the video without hardcoding the values of LocationID?

Posted October 29, 2017 4:35pm by Boban Talevski

Boban Talevski
24,793 Points
0 Answers
Eylon Cohen
4,779 Points
Using the same table on both sides of set operator

Posted October 18, 2017 3:55pm by Eylon Cohen

Eylon Cohen
4,779 Points
4 Answers
Isis van der Plas
13,445 Points
creating a list of unique books in the SQL playground

Posted October 10, 2017 12:01am by Isis van der Plas

Isis van der Plas
13,445 Points
3 Answers
drstrangequark
8,273 Points
Still having issues with Joins

Posted October 4, 2017 2:53pm by drstrangequark

drstrangequark
8,273 Points
1 Answer
drstrangequark
8,273 Points
I am SO CONFUSED about Subqueries

Posted October 3, 2017 5:24pm by drstrangequark

drstrangequark
8,273 Points
2 Answers
Johannes Scribante
19,175 Points
Database modeling tools?

Posted September 25, 2017 5:07am by Johannes Scribante

Johannes Scribante
19,175 Points
1 Answer
Danny Zhang
2,014 Points
playground 'user loans'

Posted August 31, 2017 7:05am by Danny Zhang

Danny Zhang
2,014 Points
1 Answer
Danny Zhang
2,014 Points
EXCEPT will return duplicate rows in table 1? or just unique rows in table 1?

Posted August 31, 2017 2:41am by Danny Zhang

Danny Zhang
2,014 Points
1 Answer
Noah Fields
13,985 Points
What happens when you do a Transaction with an error in it?

Posted July 28, 2017 3:34pm by Noah Fields

Noah Fields
13,985 Points
2 Answers
Noah Fields
13,985 Points
"Except", not XOR?

Posted July 28, 2017 3:03pm by Noah Fields

Noah Fields
13,985 Points
1 Answer
NiKole Maxwell
11,083 Points
Aliasing SQL Queries

Posted July 11, 2017 12:16am by NiKole Maxwell

NiKole Maxwell
11,083 Points
1 Answer
Andrew Blackwell
13,264 Points
Add other columns to EXCEPT query?

Posted July 4, 2017 11:56am by Andrew Blackwell

Andrew Blackwell
13,264 Points
2 Answers
PLUS

sir a
Courses Plus Student 3,692 Points
Bug when quering with derived tables

Posted June 18, 2017 10:42am by sir a

sir a
Courses Plus Student 3,692 Points
2 Answers
Tim Schwab
4,109 Points
Mistake in question

Posted June 16, 2017 8:17pm by Tim Schwab

Tim Schwab
4,109 Points
2 Answers
Leandro Botella Penalva
17,618 Points
Subquery vs INNER JOIN

Posted June 13, 2017 10:05am by Leandro Botella Penalva

Leandro Botella Penalva
17,618 Points
4 Answers

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