全文搜索最慢

EXPLAIN select * from `city`;

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范围搜索

EXPLAIN select * from `city` where ID>5 and ID<20;

 

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主键查询 

EXPLAIN select * from `city`where ID=5;

 

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 索引查询

EXPLAIN select * from `city`where CountryCode='NLD';

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普通查询

EXPLAIN select * from `city` where Name='Haag';