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show databases;
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create database dengheping;
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use dengheping;
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create table user(id int primary key auto_increment,name char(255));
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show tables;
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desc user;
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alter table user add password varchar(64);
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alter table user modify password varchar(64) not null;
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alter table user drop password;
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alter database mybbs default character set 'gbk';
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DROP TABLE IF EXISTS `user`;
CREATE TABLE `tbl_user` (
`userid` varchar(50) NOT NULL,
`name` varchar(50) default '',
`blog` varchar(50) default '',
  ......
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mysql> SHOW variables like "have_%";
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# MySQL Server Instance Configuration File
# ----------------------------------------------------------------------
# Generated by the MySQL Server Instance Configuration Wizard
#
#
# Installation Instructions
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#
# On Li ......