mysql loadfile 快速导入导出数据
20万导出只需几秒，听说100万数据导入也就几十秒
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1.导出数据，转为.txt文件
select * from visits where month(created_at)=6 into outfile 'f:\\visits.txt' fields terminated by ',';
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2..txt文件导入数据
load data infile 'f:\\visits.txt' into table visits fields terminated by ','
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