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create table liu(a varchar2(20),b number(2))
alter table liu rename to jin
rename jin to cai
alter table cai add c varchar2(30)
alter table cai add (d varchar2(30),e number(4))
alter table cai rename column e to f
alter table cai modify d varchar(40)
alter table cai modify f varchar(40)
alter table cai drop column f
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Author: Rainny
Date: 2010-3-5
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