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Creating User-Defined Operators: Example
This example creates a very simple functional implementation of equality and then creates an operator that uses the function:
CREATE FUNCTION eq_f(a VARCHAR2, b VARCHAR2) RETURN NUMBER AS
BEGIN
IF a = b THEN RETURN 1;
ELSE RETURN 0;
END IF;
END;
/
CREATE OPERATOR eq_op
BINDING (VARCHAR2, VARCHAR2)
RETURN NUMBER
USING eq_f;
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http://blog.csdn.net/XIAOHUI_LIAO/archive/2007/08/27/1759990.aspx
create materialized view [view_name]
refresh [fast|complete|force]
[
on [commit|demand] |
start with (start_time) next (next_time)
]
as
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1¡¢sqlplus "sys/sys@·þÎñÃû as sysdba"
2¡¢Ð޸ĿØÖÆÎļþ:
alter system set control_files='E:\oracle\oradata\myOracle_1\control01.ctl',
'E:\oracle\oradata\myOracle_1\control02.ctl','E:\oracle\oradata\my ......
create or replace procedure getok
as
cursor mycur is select ids,name from aaa where name not in (select names from ok);
vempno aaa.ids%type;
vename aaa.name%type;
begin
open mycur;
loop
fetch mycur into vempno,vename;
exit when mycur%notfound;
if mycur%found then
insert ......
TO_DATE¸ñʽ
Day:
dd number 12
dy abbreviated fri
day spelled out friday
ddspth spelled out, ordinal twelfth
Month:
mm number 03
mon abbreviated mar
month spelled out march
Year:
yy two digits 98  ......