Difference between revisions of "SELECT from BBC Tutorial"

Revision as of 13:08, 24 July 2012

bbc
name	region	area	population	gdp
Afghanistan	South Asia	652225	26000000
Albania	Europe	28728	3200000	6656000000
Algeria	Middle East	2400000	32900000	75012000000
Andorra	Europe	468	64000
...

This tutorial introduces SQL as a query language. We will be using the SELECT command on the table bbc:

Summary

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

Show the name for the countries that have a population of at least 200 million. (200 million is 200000000, there are eight zeros)

SELECT name FROM bbc
WHERE population>250000000

SELECT name FROM bbc
WHERE population>200000000

Give the name and the per capita GDP for those countries with a population of at least 200 million.

per capita GDP is the GDP divided by the population GDP/population

SELECT name, gdp/population FROM bbc
  WHERE population > 200000000

Show the name and population in millions for the countries of 'Middle East' Divide the population by 1000000 to get population in millions.

SELECT name, population/1000000 FROM bbc
  WHERE region='Middle East'

Show the name and population for 'France', 'Germany', 'Italy'

SELECT name, population FROM bbc
  WHERE name IN ('France','Germany','Italy')

Identify the countries which have names including the word 'United'

SELECT name FROM bbc
  WHERE name LIKE '%United%'

You can play a game: Find the duplicate
You can to continue practicing the the same techniques and gain more experience of the basic skills on the Nobel table. The WHERE statement using the nobel table.
You can learn about nested statements, these are instructive and entertaining, but rarely useful. Nested SELECT statements using the bbc table.

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 ==Warming up==