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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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Oracle£º1 not in (null)¼ìË÷²»³ö½á¹û

in/not   inÔÚÅжÏNULLʱÓõÄÓë=/<>Ò»ÑùµÄ·½Ê½£¬¼´±ØÐëÓÃis   nullÀ´Åжϣ¬·ñÔòʼÖÕΪʧ°Ü¡£  
  Óï¾ä  
  select   'true'   from   dual   where   (1,2)   not   in   ((2,3),(2,null));  
  ³É¹¦µÄÔ­ÒòÔÚÓÚÅж϶þÔªÖµÊ±Ê ......

OracleµÄPackageµÄ×÷ÓÃÒÔ¼°Ê¹ÓÃʲô¹¤¾ß±àд

1¡¢OracleµÄPackage³ýÁ˰Ѵ洢¹ý³Ì·Åµ½Ò»¶Ñ¶ùÒÔÍ⻹ÓÐûÓÐÆäËûµÄ×÷Ó㨺ô¦£©£¿
2¡¢ÈçºÎ°ÑÏÖÓеĴ洢¹ý³Ì¼ÓÈëµ½PackageÖУ¿
3¡¢³ýÁËʹÓÃSQL Plus£¬»¹ÓÐûÓÐʲô¹¤¾ß×öPackage?
4¡¢Ê¹ÓÃSQL Plus±àÒëPackage£¬ÊÇ·ñÿ´Î¶¼ÊDZàÒëPackageÖÐËùÓеĴ洢¹ý³Ì£¿
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oracle cast() º¯ÊýÎÊÌâ

¹Ø¼ü×Ö: oracle cast() º¯ÊýÎÊÌâ
SQL> create table t1(a varchar(10));
Table created.
SQL> insert into t1 values ('12.3456');
1 row created.
SQL> select round(a) from t1;
  ROUND(A)
----------
        12
SQL> select round(a,3) from t1;
ROUN ......

±±´óÇàÄñoracleѧϰ±Ê¼Ç17

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1.ÉùÃ÷£º
a.¸ñʽ£ºVariable_name [constant] databyte [not null] [:=default expression]
b.±äÁ¿Óë³£Á¿ÉùÃ÷»ù±¾Ò»Ö£¬Ê¹ÓÃconstantÉùÃ÷µÄΪ³£Á¿£¬²»Ê¹ÓÃΪ±äÁ¿£¬²¢ÇÒ¸³ÖµÖ»ÄÜÔÚDECLAREÇøÓò¸³Öµ£»
c.ʹÓÃ%TYPEºÍ%ROWTYPEÉùÃ÷¿ÉÒÔʹ±äÁ¿µÄÀàÐÍÓë±íÖÐ×Ö¶ÎÀàÐÍ»òÕû¸ö¼Ç¼ÀàÐͱ ......
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