Oracle基本语法集锦(用到了，收集一下)-优快云博客

本文提供了一系列 Oracle 数据库的基础语法实例，包括表、视图、同义词、存储过程、函数、触发器及游标的创建与使用，并介绍了如何进行速度优化、查找重复记录等实用技巧。

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Oracle基本语法集锦

http://database.51cto.com 2007-07-10 10:54 佚名 Csdn 我要评论(0)

摘要：本文给出了ORACLE的基本语法建立的源代码，供大家参考！
标签：语法 ORACLE 集锦
Oracle帮您准确洞察各个物流环节

1、表

create table test (names varchar2(12),
                   dates date,
                   num   int,
                   dou   double);

2、视图

create or replace view vi_test as
select * from test;

3、同义词

create or replace synonym aa
for dbusrcard001.aa;

4、存储过程

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

5、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

6、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

7、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

8、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'))

9、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)

10、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

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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