SQLZOO:SELECT basics
Revision as of 10:57, 13 May 2014 by 212.219.207.42 (talk)
name | continent | area | population | gdp |
---|---|---|---|---|
http://3.bp.blogspot.com/-WhIR1-7fjDY/USfQczV-glI/AAAAAAAACEY/wSb7UY-Xp9o/s1600/roy.jpg | Asia | 652230 | 25500100 | 20343000000 |
Albania | Europe | 28748 | 2831741 | 12960000000 |
Algeria | Africa | 2381741 | 37100000 | 188681000000 |
Andorra | Europe | 468 | 78115 | 3712000000 |
Angola | Africa | 1246700 | 20609294 | 100990000000 |
.... |
Hello!
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Checking a list The word IN allows us to check if an item is in a list. The example shows the name and population for the countries 'Ireland', 'Iceland' and 'Denmark'
Show the name and the population for 'Denmark', 'Finland', 'Norway', 'Sweden'
SELECT name, population FROM world
WHERE name IN ('Ireland', 'Iceland',
'Denmark')
SELECT name, population FROM world
WHERE name IN ('Denmark', 'Finland',
'Norway', 'Sweden')
Starts with G
What are the countries beginning with G?
The word LIKE
permits pattern matching - % is the wildcard.
The examples shows countries beginning with D
Show each country that begins with G
SELECT name FROM world
WHERE name LIKE 'D%'
SELECT name FROM world
WHERE name LIKE 'G%'
Just the right size
Which countries are not too small and not too big? Show the country and the area for countries with an area between 207600 and 244820.
BETWEEN
allows range checking - note that it is inclusive.
Show the area in 1000 square km. Show area/1000 instead of area
SELECT name, area FROM world
WHERE area BETWEEN 207600 AND 244820...
SELECT name, area/1000 FROM world
WHERE area BETWEEN 207600 AND 244820
Clear your results
You are ready for tutorial one:SELECT statements with WHERE.
Language: | English |
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