orale培训教材包括了所有的sql说明和实例

				drop table SM_NAME;
				CREATE TABLE  SM_NAME(name varchar2(10),
				telno char(10));
				
				insert into sm_name values('a','a');
				
				insert into sm_name values('我','我');
				insert into sm_name values('我们','我们');
				
				
				select length(name),name ,length(telno),telno
				from sm_name;