SELECT from WORLD Tutorial - Revision history

194.106.137.50 at 15:58, 15 February 2013

2013-02-15T15:58:19Z

194.106.137.50 at 15:57, 15 February 2013

2013-02-15T15:57:51Z

Andr3w at 21:21, 8 December 2012

2012-12-08T21:21:27Z

Andr3w: Created page with "

2012-12-08T21:10:42Z

Created page with "<div class="ref_section"> <table class='db_ref'> <tr><th>name</th><th>continent</th><th>area</th> <th>population</th><th>gdp</th></tr> <tr><td>Afghanistan</td><td>Asia</td><td..."

New page
<div class="ref_section">
<table class='db_ref'>
<tr><th>name</th><th>continent</th><th>area</th>
<th>population</th><th>gdp</th></tr>
<tr><td>Afghanistan</td><td>Asia</td><td class="r">652230</td><td class="r">25500100</td><td class="r">20343000000</td></tr>
<tr><td>Albania</td><td>Europe</td><td class="r">28748 </td><td class="r">2831741 </td><td class="r">12960000000 </td></tr>
<tr><td>Algeria</td><td>Africa</td><td class="r">2381741 </td><td class="r">37100000 </td><td class="r">188681000000 </td></tr>
<tr><td>Andorra</td><td>Europe</td><td class="r">468</td><td class="r">78115 </td><td class="r">3712000000 </td></tr><tr>
<td>Angola</td><td>Africa</td><td class="r">1246700 </td><td class="r">20609294 </td><td class="r">100990000000 </td></tr>
<tr>
<td colspan='5'>...</td>
</tr>
</table>
</div>

==World Country Profiles==
In this tutorial you will use the SELECT command on the table <code>World</code>:

<div class='extra_space' style='width:1em; height:2.5em;'></div>

<div class="progress_panel"><div>
<div class="summary">Summary</div>
<div class="progressbarbg">
<div class="progressbar"></div>
</div>
</div></div>

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

<source lang='sql' class='ans'>
SELECT name, continent, population FROM world
</source>
</div>

==Large Countries==
[[WHERE_filters |How to use WHERE to filter records.]]
<div class='qu'>
Show the name for the countries that have a population of at least 200 million. (200 million is 200000000, there are eight zeros)
<source lang='sql' class='def'>
SELECT name FROM world
WHERE population>250000000
</source>

<source lang='sql' class='ans'>
SELECT name FROM world
WHERE population>200000000
</source>
</div>

<div class='qu'>
Give the name and the per capita GDP for those countries with a population of at least 200 million.
<div title="HELP:How to calculate per capita GDP" class='hint'>
per capita GDP is the GDP divided by the population GDP/population
</div>
<source lang='sql' class='def'>
</source>

<source lang='sql' class='ans'>
SELECT name, gdp/population FROM world
WHERE population > 200000000
</source>
</div>

<div class='qu'>
Show the <code>name</code> and <code>population</code> in millions for the countries of 'Middle East'
Divide the population by 1000000 to get population in millions.
<source lang='sql' class='def'>
</source>

<source lang='sql' class='ans'>
SELECT name, population/1000000 FROM world
WHERE continent='Middle East'
</source>
</div>

<div class='qu'>
Show the <code>name</code> and <code>population</code> for 'France', 'Germany', 'Italy'
<source lang='sql' class='def'>
</source>

<source lang='sql' class='ans'>
SELECT name, population FROM world
WHERE name IN ('France','Germany','Italy')
</source>
</div>

<div class='qu'>
Identify the countries which have names including the word 'United'
<source lang='sql' class='def'>
</source>

<source lang='sql' class='ans'>
SELECT name FROM world
WHERE name LIKE '%United%'
</source>
</div>
<div>
<div class="lsclear">Clear your results</div>
<p><div class="quizlink">[[world QUIZ]]</div></p>
</div>
<h2>What Next</h2>
<ul>
<li>You can play a game:
[http://sqlzoo.net/~andrew/brain/bt.htm Find the duplicate]
</li>
<li>You can to continue practicing the the same techniques
and gain more experience of the basic skills on the Nobel table.
[[SELECT_from_Nobel_Tutorial |The <code>WHERE</code> statement using the
<code>nobel</code> table.]]
</li>
<li>You can learn about nested statements, these are instructive
and entertaining, but rarely useful.
[[SELECT_within_SELECT_Tutorial |Nested <code>SELECT</code> statements using the
<code>world</code> table.]]</li>
</ul>

name continent area population gdp

Afghanistan Asia

@@ Line 116: / Line 116: @@
    </li>
    <li>You can learn about nested statements, these are instructive and entertaining, but not essential for beginners.
-   [[SELECT_within_SELECT_Tutorial |Nested <code>SELECT</code> statements HELL YESH ;) using the
+   [[SELECT_within_SELECT_Tutorial |Nested <code>SELECT</code> statements using the
    <code>world</code> table.]]</li>
   </ul>

@@ Line 116: / Line 116: @@
    </li>
    <li>You can learn about nested statements, these are instructive and entertaining, but not essential for beginners.
-   [[SELECT_within_SELECT_Tutorial |Nested <code>SELECT</code> statements using the
+   [[SELECT_within_SELECT_Tutorial |Nested <code>SELECT</code> statements HELL YESH ;) using the
    <code>world</code> table.]]</li>
   </ul>

@@ Line 69: / Line 69: @@
 <div class='qu'>
-Show the <code>name</code> and <code>population</code> in millions for the countries of 'Middle East'
+Show the <code>name</code> and <code>population</code> in millions for the countries of 'South America'
 Divide the population by 1000000 to get population in millions.
 <source lang='sql' class='def'>
@@ Line 76: / Line 76: @@
 <source lang='sql' class='ans'>
 SELECT name, population/1000000 FROM world
-   WHERE continent='Middle East'
+   WHERE continent='South America'
 </source>
 </div>
@@ Line 103: / Line 103: @@
 <div>
 <div class="lsclear">Clear your results</div>
-<p><div class="quizlink">[[world QUIZ]]</div></p>
+<p><div class="quizlink">[[BBC QUIZ]]</div></p>
 </div>
 <h2>What Next</h2>
@@ Line 110: / Line 110: @@
    [http://sqlzoo.net/~andrew/brain/bt.htm Find the duplicate]
    </li>
-   <li>You can to continue practicing the the same techniques
+   <li>You can to continue practising the the same techniques
       and gain more experience of the basic skills on the Nobel table.
    [[SELECT_from_Nobel_Tutorial |The <code>WHERE</code> statement using the
    <code>nobel</code> table.]]
    </li>
-   <li>You can learn about nested statements, these are instructive
+   <li>You can learn about nested statements, these are instructive and entertaining, but not essential for beginners.
-     and entertaining, but rarely useful.
    [[SELECT_within_SELECT_Tutorial |Nested <code>SELECT</code> statements using the
    <code>world</code> table.]]</li>
   </ul>