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LeetCode hot100-49-N

小云晓云 2024-05-24 阅读 23

新建连接,自带world数据库 

explain SELECT * FROM `city`;
# 主键查询
explain SELECT * FROM `city` where ID=5;
# 索引查询
explain SELECT * FROM `city` where CountryCode='NLD';
# 主键范围查询
explain SELECT * FROM `city` where ID>5 and ID<20;
# 非索引范围查询
explain SELECT * FROM `city` where Population>193238 and Population<200000;
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