Difference between revisions of "SUM and COUNT Quiz"

	SELECT name, population FROM bbc WHERE region = 'Europe'
	SELECT population FROM bbc WHERE region = 'Europe' SUM BY region
	SELECT SUM(population) FROM bbc WHERE region = 'Europe'
	SELECT SUM(population FROM bbc WHERE region = 'Europe')
	SUM population FROM bbc WHERE region = 'Europe'

	SELECT COUNT(name) FROM bbc WHERE population < 150000
	SELECT COUNT(population < 150000) FROM bbc
	SELECT name FROM bbc WHERE population < 150000
	SELECT population AS COUNT FROM bbc WHERE population < 150000
	SELECT SUM() FROM bbc WHERE population < 150000

	AVG(), COUNT(), FIRST(), LAST(), SUM()
	AVG(), COUNT(), MAX(), MEDIAN(), MIN(), ROUND(), SUM()
	AVG(), COUNT(), FIRST(), LAST(), MAX(), MIN(), SUM()
	AVG(), COUNT(), MAX(), MIN(), SUM()
	COUNT(), SUM()

	SELECT AVG(population) FROM bbc WHERE name = ('Poland', 'Germany', 'Denmark')
	SELECT AVG(population) FROM bbc WHERE name IN ('Poland', 'Germany', 'Denmark')
	SELECT AVG(population) FROM bbc WHERE name LIKE ('Poland', 'Germany', 'Denmark')
	SELECT AVG(population) FROM bbc WHERE name LIKE (Poland, Germany, Denmark)
	SELECT population FROM bbc WHERE name IN ('Poland', 'Germany', 'Denmark')

	SELECT region, AVG(population/area) AS density FROM bbc
	SELECT region, COUNT(population)/COUNT(area) AS density FROM bbc GROUP BY region
	SELECT region, SUM(population)/COUNT(area) AS density FROM bbc GROUP BY region
	SELECT region, SUM(population)/SUM(area) AS density FROM bbc HAVING region
	SELECT region, SUM(population)/SUM(area) AS density FROM bbc GROUP BY region

	SELECT name, density AS population/area FROM bbc WHERE population = MAX(population)
	SELECT name, density AS population/area FROM bbc WHERE population = (SELECT MAX(population) FROM bbc)
	SELECT name, MAX (population) FROM bbc WHERE population / (SELECT area FROM bbc)
	SELECT name, population/area AS density FROM bbc WHERE population = (SELECT MAX(population) FROM bbc)
	SELECT name, population/area AS density FROM bbc WHERE population > (SELECT MAX(population) FROM bbc)

Revision as of 11:47, 18 July 2012

@@ Line 32: / Line 32: @@
 - SELECT AVG(population) FROM bbc WHERE name LIKE (Poland, Germany, Denmark)
 - SELECT population FROM bbc WHERE name IN ('Poland', 'Germany', 'Denmark')
+{Select the statement that shows the medium population density of each region
+|type="()"}
+- SELECT region, AVG(population/area) AS density FROM bbc
+- SELECT region, COUNT(population)/COUNT(area) AS density FROM bbc GROUP BY region
+- SELECT region, SUM(population)/COUNT(area) AS density FROM bbc GROUP BY region
+- SELECT region, SUM(population)/SUM(area) AS density FROM bbc HAVING region
++ SELECT region, SUM(population)/SUM(area) AS density FROM bbc GROUP BY region
 {Select the statement that shows the name and population density of the country with the largest population