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oracle cast() º¯ÊýÎÊÌâ

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;
ROUND(A,3)
----------
    12.346
SQL> select cast(a as int) from t1;
CAST(AASINT)
------------
          12
SQL> select cast(a as number(8,4)) from t1;
CAST(AASNUMBER(8,4))
--------------------
             12.3456
=========================================================
cast ÊǽøÐÐÀàÐÍת»»µÄ, ¿ÉÒÔÕë¶Ô¸÷ÖÖOracleÊý¾ÝÀàÐÍ. Ð޸ĵÄÊÇÓû§µÄÊý¾ÝÀàÐÍ.
roundÖ»ÊÇÐ޸ĵÄÊý¾ÝÏÔʾ¸ñʽ. ¶ÔÊý¾Ý×öËÄÉáÎåÈë. ÀàËÆµÄº¯Êý»¹ÓÐceil(È¡´ËÊý¾ÝµÄ×îСÕûÊý). trunc( È¡Õûº¯Êý.)
¸´ÖÆÄÚÈݵ½¼ôÌù°å
´úÂë:
SQL> select round(12.45) round,trunc(12.45) trunc,ceil(12.45) ceil
  2  from dual
  3  /
     ROUND      TRUNC       CEIL
---------- ---------- ----------
        12         12         13
SQL> select round(12.54) round,trunc(12.54) trnc,ceil(12.54) ceil
  2  from dual
  3  /
     ROUND       TRNC       CEIL
---------- ---------- ----------
        13         12         13


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Upgrade Oracle 9i RAC to Oracle 10g RAC

Upgrade Oracle 9i RAC to Oracle 10g RAC
by Vincent Chan
This article provides the procedures for converting Oracle 9i (9.2.0.4) RAC to Oracle 10g (10.2.0.1) RAC on Red Hat Enterprise Linux 3 (RHEL3).
Oracle Database 10g and Oracle Real Application Cluster (RAC) 10g itself, boast many new and ex ......

Oracle RAC 10.2.0.1 Éý¼¶ 10.2.0.4 ¼òµ¥ÃèÊö

ÍÆ¼öcrs°æ±¾¸ßÓÚdb°æ±¾
If you also plan to apply this patch to Oracle Clusterware,
ensure that you apply the patch to Oracle Clusterware before
applying it to Oracle Database. This is because Oracle Clusterware
hould always be at the same or later version as the database.
Éæ¼°µ½Êý¾Ý¿â¶ø²»ÊÇʵÀýµ ......

OracleÖг£Óõĺ¯Êý

  ---sqlµÄº¯ÊýµÄʹÓÃ(Oracle)      
      ---dualµÄʹÓãºÑÆÔª±í£ºÃ»ÓбíÐèÒª²éѯµÄʱºò ¿ÉÒÔÓÃËü
               ---select 'Hello World' from dual;     ---½á¹û£ºH ......

Oracle Linux Æð動¤ÈÍ£Ö¹¤Î×Ô動»¯

¤½¤ÎËû¤Î¥ª¥Ú¥ìー¥Æ¥£¥ó¥°?¥·¥¹¥Æ¥à¤Ë¤ª¤±¤ë¥Çー¥¿¥Ùー¥¹¤ÎÆð動¤ÈÍ£Ö¹¤Î×Ô動»¯
dbstart¤ª¤è¤Ódbshut¥¹¥¯¥ê¥×¥È¤òʹÓ䷤ƥÇー¥¿¥Ùー¥¹¤ÎÆð動¤ÈÍ£Ö¹¤ò×Ô動»¯¤¹¤ë¤Ë¤Ï¡¢´Î¤ÎÊÖ順¤ò実ÐФ·¤Þ¤¹¡£
root¥æー¥¶ー¤Ç¥í¥°¥¤¥ó¤·¤Þ¤¹¡£
¥×¥é¥Ã¥È¥Õ ......

ORACLE µÄ²¹¶¡ÏÂÔØµØÖ· (ת)

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¹Ø¼ü×Ö: oracle
9.2.0.4  = 3095277
9.2.0.5  = 3501955
9.2.0.6  = 3948480
9.2.0.7  = 4163445
9.2.0.8  = 4547809£¨9i×îÖÕ£©
10.1.0.3 = 3761843
10.1.0.4 = 4163362
10.1.0.5 = 4505133
10.2.0.2 = 4547817
10.2.0.3 = 5337014
10.2.0.4 = 6810189
ÏÂ ......
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