javazhou

create  table "student"(  id number(11,0),  stuname varchar2(20),  subject varchar(20),  grade number(4,2),  primary key(id))   insert into "student" values(201001,'javazhou','语文',90);insert into "s...

declare   tableCount number; begin   select count(*) into tableCount from user_all_tables where table_name = 'STUDENT';   if tableCount > 0 then      execute immediate 'drop table STUDENT'...