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Novice learning SQL: help with sql code


#1

Show the countries which have a name that includes the word 'United'
in a table

this code does not work what do I need to change, it should return
United Arab Emirates
United Kingdom
United States


#2

Use the LIKE operator

LIKE


#3
SELECT name
FROM world
WHERE name like 'United%'

Note that '*' is not a wildcard character according to the SQL standard


#4

Note that

name like 'United%'

will match country names that START with "United", whereas if you want INCLUDES you would need to do:

name like '%United%'

Beware that putting the wildcard ("%") at the start can have significant performance implications compared to only putting it at the end. On a small database it is unlikely to make any noticeable difference, but as the database size grows it can be an issue.


#5

Show the countries that are big by area or big by population. Show name, population and area. country is big if it has an area of more than 3 million sq km or it has a population of more than 250 million.

select name, population, area from world
if population >25000000 or area > 3000000


#6

Change IF to WHERE


#7

Do you have a good guide to basic SQL Syntax? here's one. SQL cheat sheet


#8

sorry guys I am a total novice to SQl, all this is new,
I am learning SQL and determined to get better. I have a book and I am also learning online.
thank you for all your help so far, I know these questions can be trying


#9

Don't worry, we've got no problem with Newbie questions. Only requirement is that you show what you have one so far - because if we do it all for Students then they won't learn anything :slightly_smiling: but you've done that, so all is fine and dandy :sunny: