Posted on 2009-03-30 10:24
AntiquMan 阅读(149)
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Oracle
1、表
create table test (names varchar2(12),
dates date,
num int,
dou double);
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2、视图
create or replace view vi_test as
select * from test;
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3、同义词
create or replace synonym aa
for dbusrcard001.aa;
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4、存储过程
create or replace produce dd(v_id in employee.empoy_id%type)
as
begin
end
dd;
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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
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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 %26lt; 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 %26lt;%26gt; :new.names then
reaise_replaction_err(-2002,"关键字不能修改")
end if
end if
end
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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
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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 %26gt; date('2003-01-01','yyyy-mm-dd')
select names,dates
from test
where names not in ( select names
from b
where dates %26gt; to_date('2003-01-01','yyyy-mm-dd'))
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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)
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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 %26lt; 11
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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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