Oracle µÄÊÓͼÓëË÷Òý
ÓбíA(×Ö¶ÎA1,A2)ºÍ±íB(×Ö¶ÎB1,B2).
×Ö¶ÎA2,B2É϶¼ÓÐË÷Òý.
A,B ±íÁª²é
sql1 Õâ¸ösql ·Ç³£¿ì 2ÃëµÄÑù×Ó
select * from A,B where A.A1=B.B1(+) and A2='Öµ1'
sql2 Õâ¸ösql Âýµ½ÈÃÈËÎÞ·¨ÈÌÊÜ
select * from A,B where A.A1=B.B1(+) and B2='Öµ1'
ÍâÁªÒÔºó ±íBÉϵÄË÷Òý²»Æð×÷ÓÃÁË.
Èç¹û»»³ÉÄÚÁª ËٶȺܿì.
select * from A,B where A.A1=B.B1 and B2='Öµ1'
1.ÎﻯÊÓͼ
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CREATE MATERIALIZED VIEW m_tb REFRESH WITH ROWID as select * from tb;
create index idx_tb on m_tb(col1);
2.ÓÃhintÓï¾äÇ¿ÖÆÖ¸¶¨ÓÅ»¯Æ÷ÀàÐÍ
select /*+index(A,idx_a1) index(B,idx_b1)*/* from A,B where A.A1=B.B1(+) and B1='Öµ1'
2010-02-16 16:04:51 BY TZC
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CREATE TABLE student (
xh number primary key,
Name varchar2(10) not null);
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START WITH 1
INCREMENT BY 1
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Dim rs As ADODB.Recordset
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