Difference between revisions of "SQLZOO:About"

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(Terms and Conditions)
(Terms and Conditions)
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SQLZoo includes tutorials and reference to support people learning SQL.
 
SQLZoo includes tutorials and reference to support people learning SQL.
 
==Terms and Conditions==
 
==Terms and Conditions==
None. Everyone in the whole world is welcome to use this site in any way they see fit; that's how the internet works. By using this site you are under a moral obligation to do one of the following:
+
None. Everyone in the world is welcome to use this site in any way they see fit; that's how the internet should work. By using this site you are under an obligation to do one of the following:
 
*Buy my book SQL Hacks, published by O'Reilly
 
*Buy my book SQL Hacks, published by O'Reilly
*Buy me a drink, I'm Andrew Cumming and I'm usually in the Blue Blazer in Edinburgh on a Monday evening
+
*Buy me a drink, I'm Andrew Cumming and I'm usually in the Blue Blazer in Edinburgh on a Monday evening. If Edinburgh is too far away you can buy a drink for the next englishman you meet, it's then his job to find me and return the favour.
 
*Tell people that Edinburgh Napier University is a great place to study.
 
*Tell people that Edinburgh Napier University is a great place to study.
 
*Link to https://sqlzoo.net from a publicly visible web page
 
*Link to https://sqlzoo.net from a publicly visible web page

Revision as of 19:47, 12 November 2017

SQLZoo includes tutorials and reference to support people learning SQL.

Terms and Conditions

None. Everyone in the world is welcome to use this site in any way they see fit; that's how the internet should work. By using this site you are under an obligation to do one of the following:

  • Buy my book SQL Hacks, published by O'Reilly
  • Buy me a drink, I'm Andrew Cumming and I'm usually in the Blue Blazer in Edinburgh on a Monday evening. If Edinburgh is too far away you can buy a drink for the next englishman you meet, it's then his job to find me and return the favour.
  • Tell people that Edinburgh Napier University is a great place to study.
  • Link to https://sqlzoo.net from a publicly visible web page
    • Users of learning environments such as Moodle have a responsibility to find a way to let web crawlers follow their links or to promote sqlzoo and other material that they reference some other way. Links from universities and schools (ending ac.uk or .edu for example) are especially valuable. If you are a teacher using SQLzoo please find a way.

If something is broken then I will fix it qa.sqlzoo@gmail.com

Why is it called SQLzoo

I don't really like zoos. I like to see animals but they often look a little sad when kept in zoos. Once I took my children to Edinburgh Zoo and we spent the day trudging around the exotic exhibits. The greatest excitement of the day was when we were having our picnic and the children spotted some "real" animals - rabbit grazing on a grassy bank next to the zoo.

The inmates of SQLzoo are the SQL engines (MySQL, Oracle, SQL Server and others). They have been tamed, caged and defanged so that members of the public can pet them or poke them or gawk at them. In the wild, these engines are dangerous, needy beasts but in the confines of SQLzoo they are relatively safe. Once you have an idea of what SQL is and how it works you should install an SQL engine on your own computer and play with the real thing.

Wiki Nature

It is based on MediaWiki and it allows users to change the content. http://www.mediawiki.org/wiki/Help:Editing_pages shows how to edit pages in "standard" media wiki.

  • Only users with the teacher role can edit pages.
    • Any teachers who can help with fixing errors or creating content are most welcome
    • Send an email (ideally from an educational address) to qa.sqlzoo@gmail.com and tell us your user name - we can add that role so that you can edit.

SQLZoo features:

  • Interactive access to several SQL engines
  • Sample databases
  • Practical exercise
  • Instant feedback on the success of the student's attempts

Data

The data used in the databases is available in a slightly odd version of SQL:

For example

Format

SQLZoo includes a number of extensions to normal Wiki text:

  • class='qu'
    • A div with class qu is interpreted as an interactive question.
    • A div.qu element should include a source.def element
      • This contains the default text that the user sees.
      • Sometime this is a useful hint and is close to the correct answer.
      • It may be empty - but users often click without changing the text before even looking at it
    • A div.qu element may include a source.ans element
      • This contains the correct SQL.
      • This is hidden from the user (but not well hidden)
      • The user's result is compared with the answers result and a score is calculated

Here is an example of a question:

==Warming up==
<div class='qu'>
[[Read the notes about this table.]] Observe the result of running a simple SQL command.
<source lang='sql' class='def'>
SELECT name, region, population FROM bbc
</source>
<source lang='sql' class='ans'>
SELECT name, region, population FROM bbc
</source>
</div>

And here is how that looks when rendered...

Warming up

Read the notes about this table. Observe the result of running a simple SQL command.

SELECT name, region, population FROM bbc
SELECT name, region, population FROM bbc

StartAt

You can include a ***startAt*** span at the top of the page. This will ensure that question numbering starts at the specified value.


<span id=startAt class=params>6</span>

respectorder

Most questions do not respect order - a querry is considered correct even if the order of the student's work differs from the correct answer. You can over-ride that rule by insisting that the question respects order. Place this invisible tag in your qu tag.


<span class='params respectorder'></span>

Hints

You can include a hint. The title will be shown, if the user clicks on the text the body will be revealed:

Now the hint has been revealed

<div class='hint' title='Click here to see the hint'>Now the hint has been revealed</div>

Clear Results


<div class="lsclear">Clear your results</div>

Clear your results

Setting up AWS server

  • Start with Amazon Linux - pick a paravirtual one from the bottom of the list of AMI - the ones at the top
  • Use classic network
  • Log in as ec2-user
sudo su
yum install httpd
scp -C andrew@146.176.166.2:sqlzoo-source.tar ~
mv ~/public_html/sqlzoo /var/www/html
yum install mysql-server
/etc/init.d/mysqld start
/usr/bin/mysqladmin -u root password 'topsecret'
scp andrew@146.176.166.2:sqlzoo_wiki.sql.gz ~
scp andrew@146.176.166.2:gisq.sql.gz ~
yum install php
yum install php-pear
yum install php-mysql
/etc/init.d/httpd restart

mysql...

create database gisq;
grant all on gisq.* to gisq@localhost identified by 'brazil';
grant select on gisq.* to scott identified by 'tiger';
create database scott;
use scott
grant all on scott.* to scott identified by 'tiger';
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