LeetCode-Big Countries
阿新 • • 發佈:2018-12-10
Description: 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 | +--------------+-------------+--------------+
題意:要求用SQL語句查詢表World中滿足area大於3百萬或者population大於2千5百萬的記錄,輸出屬性列name,population和area
解法:直接使用SELECT查詢語句,條件可用WHERE來約束
# Write your MySQL query statement below
SELECT name,population,area FROM World WHERE area > 3000000 OR population > 25000000;