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CREATE OR REPLACE TYPE AddressType AS OBJECT
(
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City varchar2(20),
Street varchar2(30)
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CREATE OR REPLACE TYPE SuperStarType AS OBJECT
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StarName varchar2(30),
Addres ......

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Oracle Group By Ó÷¨Ö® —— Having

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1)²é¿´ÏµÍ³ÄÚ´æ
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1.forcing log switches
sql> alter system switch logfile;
2.forcing checkpoints
sql> alter system checkpoint;
3.adding online redo log groups
sql> alter database add logfil ......
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