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 create materialized view [view_name]
refresh [fast|complete|force]
[
on [commit|demand] |
start with (start_time) next (next_time)
]
as
{´´½¨ÎﻯÊÓͼÓõIJéѯÓï¾ä}
ÒÔÉÏÊÇ ......

ÓëoracleÊý¾Ý¿âÁ¬½ÓÎÊÌâ

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    ÖÜÎåÍíÉÏ»»ÁË·þÎñÆ÷£¬ÖÜÒ»ÔçÉÏ·¢ÏÖ³¬ÉùµÄ¹¤×÷Õ ......

Oracle Á¬½Ó ¸´Ï°

SQL> select * from ta;
        ID NAME
---------- --------------------
         1 gorey
         2 gorey2
SQL> select * from tb;
        I ......

Oracle union intersect minus ¸´Ï°

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        ID NAME
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         1 gorey
       &nb ......

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ת×Ô£ºhttp://download.oracle.com/docs/cd/B13789_01/server.101/b10759/statements_6004.htm
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 VARCHA ......
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