Difference between revisions of "Read the notes about this table."

From SQLZOO
Jump to: navigation, search
Line 1: Line 1:
<h3 class="1">BBC Country Profiles.</h3>
+
<h3 class="1">The '''world''' table.</h3>
 
<p>Some points to note:</p>
 
<p>Some points to note:</p>
 
<ul>
 
<ul>
   <li>There is a table called <code>bbc</code> with nearly 200 records.</li>
+
   <li>There is a table called <code>world</code> with nearly 200 records.</li>
 
   <li>The first record is <code>Afghanistan</code> in <code>Asia</code> </li>  
 
   <li>The first record is <code>Afghanistan</code> in <code>Asia</code> </li>  
 
   <li>The final record is <code>Zimbabwe</code> in <code>Africa</code>.</li>  
 
   <li>The final record is <code>Zimbabwe</code> in <code>Africa</code>.</li>  
 
   <li>The table has five columns or <code>attributes</code> . These are:  
 
   <li>The table has five columns or <code>attributes</code> . These are:  
  <ul>
+
<table class="sqlmine"><tbody><tr><th>Field</th><th>Type</th><th>Null</th><th>Key</th><th>Default</th><th>Extra</th></tr><tr><td>name</td><td>varchar(50)</td><td>NO</td><td>PRI</td><td class="r">null</td><td class="r"></td></tr><tr><td>continent</td><td>varchar(60)</td><td>YES</td><td>MUL</td><td class="r">null</td><td class="r"></td></tr><tr><td>area</td><td>decimal(10,0)</td><td>YES</td><td></td><td class="r">null</td><td class="r"></td></tr><tr><td>population</td><td>decimal(11,0)</td><td>YES</td><td></td><td class="r">null</td><td class="r"></td></tr><tr><td>gdp</td><td>decimal(14,0)</td><td>YES</td><td></td><td class="r">null</td><td class="r"></td></tr><tr><td>capital</td><td>varchar(60)</td><td>YES</td><td></td><td class="r">null</td><td class="r"></td></tr><tr><td>tld</td><td>varchar(5)</td><td>YES</td><td></td><td class="r">null</td><td class="r"></td></tr><tr><td>flag</td><td>varchar(255)</td><td>YES</td><td></td><td class="r">null</td><td class="r"></td></tr></tbody></table>
    <li><code>name</code></li>  
 
    <li><code>region</code></li>  
 
    <li><code>area</code></li>  
 
    <li><code>population</code></li>  
 
    <li><code>gdp</code></li>
 
  </ul>
 
 
   </li>
 
   </li>
 
</ul>
 
</ul>

Revision as of 09:17, 13 September 2017

The world table.

Some points to note:

  • There is a table called world with nearly 200 records.
  • The first record is Afghanistan in Asia
  • The final record is Zimbabwe in Africa.
  • The table has five columns or attributes . These are: <tbody></tbody>
    FieldTypeNullKeyDefaultExtra
    namevarchar(50)NOPRInull
    continentvarchar(60)YESMULnull
    areadecimal(10,0)YESnull
    populationdecimal(11,0)YESnull
    gdpdecimal(14,0)YESnull
    capitalvarchar(60)YESnull
    tldvarchar(5)YESnull
    flagvarchar(255)YESnull

An extract from the table bbc

name region area population gdp
Yemen Middle East 536869 21500000 12255000000
Zambia Africa 752614 11000000 4950000000
Zimbabwe Africa 390759 12900000 6192000000

Footnotes

Per Capita GDP

The per capita GDP is the GDP divided by the population. It is a rough measure of the average salary. A rich country is one with a high per capita GDP.

Original source

This data has been collected from the BBC country profiles - it may be a little out of date. The latest version can be found at http://news.bbc.co.uk/1/hi/world/default.stm Some changes have been made to the data - the reader should assume that errors and omissions are due to me and not the peerless BBC.

Area

The area is measured in square kilometers.

GDP

I have taken the liberty of multiplying the GNI per capita (as published by the BBC) by the population. I am pretty sure that this is not correct but these tutorials are about databases not about economics.

Scientific Notation

Some implementations of SQL may show large numbers in scientific notation. The number 6.23 E9 means 6.23 x 10 9 which is 6.23 x 1,000,000,000 which is 6,230,000,000
A Million is 10 6 which is 1,000,000
A Billion is 10 9 which is one thousand million which is 1,000,000,000
A Trillion is 10 12 , which is one million million which is 1,000,000,000,000.


Language: English  • Deutsch