发布日期:2015-10-19 13:29 来源: 标签: oracle教程 oracle函数大全 oracle语法 oracle基本语法集锦
本章节我们将学习oracle基本语法,下面我们就做一下具体讲解,希望大家多多支持中国站长网络学院。

-- 表
create table test (names varchar2(12),
                   dates date,
                   num   int,
                   dou   double);
-- 视图
create or replace view vi_test as
select * from test;

-- 同义词
create or replace synonym aa
for dbusrcard001.aa;

-- 存储过程
create or replace produce dd(v_id in employee.empoy_id%type)
as
begin
  
end
dd;

-- 函数
create or replace function ee(v_id in employee%rowtype) return varchar(15)
is
var_test varchar2(15);
begin
  return var_test;
exception when others then
  
end

-- 三种触发器的定义
create or replace trigger ff
alter delete
on test
for each row
declare
begin
   delete from test;
   if sql%rowcount < 0 or sql%rowcount is null then
      rais_replaction_err(-20004,"错误")
   end if
end

create or replace trigger gg
alter insert
on test
for each row
declare
begin
   if :old.names = :new.names then
      raise_replaction_err(-2003,"编码重复");
   end if
end

create or replace trigger hh
for update
on test
for each row
declare
begin
  if updating then
     if :old.names <> :new.names then
 reaise_replaction_err(-2002,"关键字不能修改")
     end if
  end if
end

-- 定义游标
declare
   cursor aa is
      select names,num from test;
begin
   for bb in aa
   loop
        if bb.names = "ORACLE" then
       
        end if
   end loop;
  
end

-- 速度优化,前一语句不后一语句的速度快几十倍
select names,dates
from test,b
where test.names = b.names(+) and
      b.names is null and
      b.dates > date(''2003-01-01'',''yyyy-mm-dd'')

 
select names,dates
from test
where names not in ( select names
                       from b
                      where dates > to_date(''2003-01-01'',''yyyy-mm-dd''))
                     

-- 查找重复记录
select names,num
from test
where rowid != (select max(rowid)
                 from test b
                where b.names = test.names and
                      b.num = test.num)

-- 查找表TEST中时间最新的前10条记录
select * from (select * from test order by dates desc) where rownum < 11

-- 序列号的产生
create sequence row_id
minvalue 1
maxvalue 9999999999999999999999
start with 1
increment by 1

insert into test values(row_id.nextval,....) 

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专题信息
    Oracle Database,又名Oracle RDBMS,或简称Oracle。是甲骨文公司的一款关系数据库管理系统。它是在数据库领域一直处于领先地位的产品。本教程重点讲解Oracle函数、SQL语言、PL/SQL语言、oracle安装、SQL技巧等多方面的知识,对大家学习Oracle以及Oracle的实际应用有很大帮助。