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big-countries.sql
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27 lines (25 loc) · 1.36 KB
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# Time: O(n)
# Space: O(1)
# There is a table World
# +-----------------+------------+------------+--------------+---------------+
# | name | continent | area | population | gdp |
# +-----------------+------------+------------+--------------+---------------+
# | Afghanistan | Asia | 652230 | 25500100 | 20343000 |
# | Albania | Europe | 28748 | 2831741 | 12960000 |
# | Algeria | Africa | 2381741 | 37100000 | 188681000 |
# | Andorra | Europe | 468 | 78115 | 3712000 |
# | Angola | Africa | 1246700 | 20609294 | 100990000 |
# +-----------------+------------+------------+--------------+---------------+
#
# A country is big if it has an area of bigger than 3 million square km or a population of more than 25 million.
# Write a SQL solution to output big countries' name, population and area.
# For example, according to the above table, we should output:
# +--------------+-------------+--------------+
# | name | population | area |
# +--------------+-------------+--------------+
# | Afghanistan | 25500100 | 652230 |
# | Algeria | 37100000 | 2381741 |
# +--------------+-------------+--------------+
SELECT name, population, area
FROM World
WHERE area > 3000000 OR population > 25000000;