Union比or快 Using UNION is faster when it comes to cases like scan two different column。
摘要：
problem： 595. Big Countries 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 阅读全文
posted @ 2019-08-25 10:01 jwang106 阅读(303) 评论(0) 推荐(0)
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