Oracle基本语法集锦

dn001 2007-12-01 22:06:14

1、表

create table test (names varchar2(12),
dates date,
numint,
doudouble);

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,....)