ORACLE的基本语法集锦

-- 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,....)