ORACLE的基本语法集锦

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-- 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(&#39;2003-01-01&#39;,&#39;yyyy-mm-dd&#39;)

select names,dates
from test
where names not in ( select names
            from b
           where dates > to_date(&#39;2003-01-01&#39;,&#39;yyyy-mm-dd&#39;))
            
-- 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,....)