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create database testName1;
alter user 'userName'@'localhost' identified by 'New-Password-Here';
create table tb_name ( product_id char(4) not null, product_name varchar(100), price integer, regist_date date, size integer, primary key (product_id) )
alter tb_name add column name varchar(100); alter tb_name drop column name;
start transation; insert into tb_name values ('0001', 'name1', 400, null ,2008-06-01) commit;