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show databases;
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show tables;
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describe ±íÃû;
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create database ¿âÃû;
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use ¿âÃû;
create table ±íÃû (×Ö¶ÎÉ趨Áбí);
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drop database ¿âÃû;
drop table ±íÃû;
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delete from ±íÃû;
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select * from ±íÃû;
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