sqlserver copy table data to another table

In SQL Server, if the target table exists:

insert into 目标表 select * from 原表;

In SQL Server, if the target table does not exist:

select * into 目标表 from 原表;

In Oracle, if the target table exists:

insert into 目标表 select * from 原表;

commit ;

In Oracle, if the target table does not exist:

create  table  目标表  as  select  *  from  原表;