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

-- 同義詞
create or replace synonym aa
for dbusrcard001.aa;

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

-- 函數
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

-- 三種觸發器的定義
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,"錯誤")
?? 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,"編碼重復");
?? 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,"關鍵字不能修改")
???? end if
? end if
end

-- 定義游標
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

-- 速度優化，前一語句不后一語句的速度快幾十倍
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'))

-- 查找重復記錄
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中時間最新的前10條記錄
select * from (select * from test order by dates desc) where rownum < 11

-- 序列號的產生
create sequence row_id
minvalue 1
maxvalue 9999999999999999999999
start with 1
increment by 1

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

總結

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