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--sqlplus
sqlplus;
sys /password as sysdba;
--²éÕÒÓû§ID£¨user#£©,Êý¾Ý¿âÀïÃæ´æ·ÅµÄÓû§¶¼ÊÇ´óд!
select user#,name,password from user$ where name ='FACT';
USER# NAME PASSWORD
91 FACT 7A0F2B316C212D67
-¸ù¾ÝÓû§ID ¸üÐÂÓû§Ãû¡£
update user$ set name= FACT where user#=91;
--Ìá½»¡£
commit;
--È·ÈÏÓû§ÃûÊÇ·ñ¸üгɹ¦¡£
select user#,name,password from user$ where USER# = 91;
USER# NAME PASSWORD
91 FACT 7A0F2B316C212D673
--ÐÞ¸ÄÓû§ÃÜÂë¡£
alter user fact identified by fact;
--ÊÖ¹¤Ö´Ðмì²éµã²Ù×÷£¬½«Database Buffer CacheÖеÄÊý¾ÝÇ¿ÖÆÐ´³öµ½Íâ´æ¡£
alter system checkpoint;
--Ç¿ÖÆË¢ÐÂShared Pool£¡ÒòΪOracleµÄÊý¾Ý×ÖµäÐÅÏ¢ÊÇ»º´æÔÚShared PoolµÄDictionary CacheÖеġ£
alter system flush shared_pool;
--È·ÈÏÃÜÂëÊÇ·ñÐ޸ijɹ¦¡£
select user#,name,password from user$ where USER# = 91;
USER# NAME PASSWORD
91 FACT 7A0F2B316C212D67
--²âÊÔÓû§ÊÇ·ñ¿ÉÓá£
conn fact/fact
Connected.
show user
USER is "FACT"
--ÖØÆôORACLE·þÎñ
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select t.id ,t.code, t.name ,t.pid
,SYS_CONNECT_BY_PATH(t.id,'.')||'.' as IdPath
from tas_catalog t
--where id!=110
start with id=110
connect by pid = prior id
order siblings by id
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select t.id ,t.code, t.na ......
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1. inner join / left join/ right join / full join
select a.dname, b.ename from dept a, emp b where a.deptno=b.deptno and a.deptno=10;
select a.dname, b.ename from dept a inner join emp b
on a.deptno=b.deptno and a.deptno=10;
select dname,ename from dept natural ......
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1. Oracle°²×°Íê³ÉºóµÄ³õʼ¿ÚÁî?
¡¡¡¡internal/oracle
¡¡¡¡sys/change_on_install
¡¡¡¡system/manager
¡¡¡¡scott/tiger
¡ ......
in/not inÔÚÅжÏNULLʱÓõÄÓë=/<>Ò»ÑùµÄ·½Ê½£¬¼´±ØÐëÓÃis nullÀ´Åжϣ¬·ñÔòʼÖÕΪʧ°Ü¡£
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select 'true' from dual where (1,2) not in ((2,3),(2,null));
³É¹¦µÄÔÒòÔÚÓÚÅж϶þÔªÖµÊ±Ê ......
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oracleÖÐÓлù±¾µÄÊý¾ÝÀàÐÍ£¬Èçnumber£¬varchar2£¬date£¬numeric£¬float....µ«ÓÐʱºòÎÒÃÇÐèÒªÌØÊâµÄ¸ñʽ£¬È罫name¶¨ÒåΪ
£¨firstname,lastname£©µÄÐÎʽ£¬ÎÒÃÇÏë°ÑÕâ¸ö×÷Ϊһ¸ö±íµÄÒ»Áп´´ý£¬Õâʱºò¾Í²»ÒªÎÒÃÇ×Ô¼º¶¨ÒåÒ»¸öÊý¾ÝÀàÐÍ
create or replace type type_name as object(firstname varchar ......