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create sequence ÐòÁÐÃû
minvalue 1(ÉèÖÃ1Ϊ×îСֵ)
maxvalues 1.0E28(orcale ĬÈÏ×î´óֵΪ1.0E28)
start with 1 ( ³õʼֵΪ1)
increment by 1 (²½³¤Îª1 ,Ò²¾ÍÊÇÿ´ÎÔö¼Ó1)
noorder (Õâ¸öÊÇÉèÖÃΪ ²»ÅÅÐò)
nocycle (Õâ¸öÊÇÉèÖÃΪ ²»Ñ»·)
nocache(Õâ¸öÊÇÉèÖÃΪ ûÓлº³å)
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create trigger ´¥·¢Æ÷Ãû before insert on ±íÃû for each row
as
begin
select ÐòÁÐÃû.nextval into :new.id from dual;
end;
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1¡¢±à¼ /etc/apt/sources.list £º
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak #±¸·Ý
sudo gedit /etc/apt/sources.list
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deb http://oss.oracle.com/debian unst ......
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Óï·¨£ºPartition by range(×Ö¶ÎÃû)(
Partition ·ÖÇøÃû values less than (60), --60ÒÔÏÂ
Partition ·ÖÇøÃû values less than (75), --60¡«75
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Alter table student add partition ·ÖÇøÃû values less than(100);
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Alter table student drop partition ·ÖÇøÃû;
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Alter table student truncate partition ·ÖÇøÃû;
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SQL> select to_char(sysdate,'YYYYMMDD W HH24:MI:SS') from
dual;
TO_CHAR(SYSDATE,'YY
-------------------
20030327 4 18:16:09
SQL> select to_char(sysdate,'W') from dual;
T
-
4 ......