Oracle基本语法

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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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