oracle5
触发器
序列号：有oracle自动生成，为了在多用户同时操作数据库
create sequence name
start with 1000
increment by 1
nomaxvalue
nocycle
查询序列信息
select sequence_name,min_value,increment_by,cycle_flag from user_sequences;
插入
insert into emp
values(emp_sequence.nextval,'','')--伪列
select sequence_name.currval,sequence_name.nextval from dual
查看用户序列
desc user_sequences;
修改序列号
alter sequence emp_seq
increment by 2
cache 30;
删除序列号
drop sequence emp_seq;
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oracle中的函数
create or replace function name(f float)
return float
begin
return 3.14*(f*f);
end;
查询函数
select object_name,object_type ,created,status from user_objects;
调用函数
select name(4) from dual;
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游标
cursor cur_name is sql_statements;
open cur_name;
fetch cur_name into
eg
loop
fetch cur_select_emp into name,job,sal
exit cur_select_emp%notfound;
end loop;
close cur_select_emp;
游标属性
%isopen,%rowcount,%found
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同义词:对象的别名
create public synonym department for scot.dept;
drop public synonym department
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角色管理
create role role_name
alter role role_name
grant create session,create any table,create view to role_name
create user user_name
grant role_name to user_name with admin option
revoke role_name from user_name
drop role role_name
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用户管理
drop user user_name
alter user name identified by pwd account unlock
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系统和对象权限
表、索引、对话、表空间
select * from dba_sys_privs
回收权限不是级联的
select * from user_col_privs_made;
grant update(col_name) on table_name to user_name with grand option;
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概要文件管理用户资源