怎么用sql语句删除外键?(不用约束名)
脚本:
create table books(
bookid char(20) primary key,
bookname char(50),
bookauthor char(30),
bookpublic char(30),
price number);
alter table books
add isbn varchar2(10);
alter table books
add foreign key (isbn) references readers(readerid);
然后怎么删除它呢?(不用约束名)
是Oracle 10g 数据库