Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

oracle sql×Ô¶¯µÝÔö

Ò»¡¢É¾³ýÁÐ
ALTER TABLE AA DROP COLUMN  DEP;
ÊÊÓÃÓÚС±í-----Êý¾ÝÁ¿Ð¡µÄʱºò£»
2¡¢ALTER TABLE AA SET UNUSED("DEP") CASCADE CONSTRAINTS;
È»ºóÔÚ¸ºÔØÐ¡µÄʱºò£¬É¾³ý
ALTER TABLE AA DROP UNUSED COLUMNS;
¶þ¡¢Ìí¼ÓÁÐ
ÏȼÓÒ»ÐÂ×Ö¶ÎÔÙ¸³Öµ£º
alter table table_name add mmm  varchar2(10);
update table_name set mmm=** ;
Èý¡¢ÉèÖÃ×Ö¶ÎÖµ×Ô¶¯Ôö¼Ó
insert into t_address (addressname) (select vcname from busstop)
create sequence seq_id_test_increment    --ÐòÁÐ
increment by 1 start with 1 maxvalue 9999999;   
  
create or replace trigger insert_test_increment    --´¥·¢Æ÷
before insert on t_address    --t_address    ±í
referencing   
new as new   
old as old   
for each row   
begin  
    select seq_id_test_increment.nextval into :new.addressid from dual;    --addressid×Ö¶Î
end;


Ïà¹ØÎĵµ£º

SQLServerºÍOracleµÄ³£Óú¯Êý¶Ô±È

SQLServerºÍOracleµÄ³£Óú¯Êý¶Ô±È
¡¡¡¡1.¾ø¶ÔÖµ
¡¡¡¡S:select abs(-1) value
¡¡¡¡O:select abs(-1) value from dual
¡¡¡¡2.È¡Õû(´ó)
¡¡¡¡S:select ceiling(-1.001) value
¡¡¡¡O:select ceil(-1.001) value from dual
¡¡¡¡3.È¡Õû£¨Ð¡£©
¡¡¡¡S:select floor(-1.001) value
¡¡¡¡O:select floor(-1.001) valu ......

SQLSERVER SQLÐÔÄÜÓÅ»¯

1.Ñ¡Ôñ×îÓÐЧÂʵıíÃû˳Ðò(Ö»ÔÚ»ùÓÚ¹æÔòµÄÓÅ»¯Æ÷ÖÐÓÐЧ)¡¡¡¡
¡¡¡¡ SQLSERVERµÄ½âÎöÆ÷°´ÕÕ´ÓÓÒµ½×óµÄ˳Ðò´¦Àífrom×Ó¾äÖеıíÃû£¬Òò´Ëfrom×Ó¾äÖÐдÔÚ×îºóµÄ±í£¨»ù´¡±ídriving table£©½«±»×îÏÈ´¦Àí£¬ÔÚfrom×Ó¾äÖаüº¬¶à¸ö±íµÄÇé¿öÏ£¬±ØÐëÑ¡Ôñ¼Ç¼ÌõÊý×îÉٵıí×÷Ϊ»ù´¡±í£¬µ±SQLSERVER´¦Àí¶à¸ö±íʱ£¬»áÔËÓÃÅÅÐò¼°ºÏ²¢µÄ·½Ê½Á ......

win7 °²×° oracle ¿Í»§¶Ë

µ±Ç°Èκΰ汾µÄORACLE¿Í»§¶ËÔÚÈκΰ汾µÄWINDOWS7É϶¼²»ÄÜÕý³£Íê³É°²×°¡£
    Ö÷ÒªÊÇÒòΪORACLE°²×°µÄÏȾöÌõ¼þÀï²Ù×÷ϵͳ°æ±¾²»·ûºÏ£¬µ«ÊÇÕâ¸öÒÉÎÊ¿ÉÒÔÐÞ¸Ärefhost.xml´¦Àí£¬ ¾ßÌåÊÇÔÚrefhost.xmlÖÐÌí¼Ó
  <!--Microsoft Windows 7-->
  <OPERATING_SYSTEM>
    & ......

³£¼ûOracleÊý¾Ý¿â±¸·Ý²ßÂÔ½éÉÜ

1 ²Ù×÷ϵͳ±¸·Ý
²Ù×÷ϵͳ±¸·ÝºÍ»Ö¸´ÊµÊ©ÆðÀ´±È½Ï¼òµ¥£¬µ±È»Ò²±È½Ï·Ñʱ£¬ÒªÇóϵͳֹͣʹÓ㬴˹ý³Ì°üÀ¨¹Ø±ÕÊý¾Ý¿â²¢´ÓϵͳÉÏ×¢ÏúËùÓÐÓû§¡£ËùÓзÃÎʱ»½â³ýÖ®ºó£¬ÏµÍ³¹Ø±Õ²¢ÒÔµ¥Óû§·½Ê½ÖØÐÂÆô¶¯£¬¿ØÖÆÈ¨½»¸øÏµÍ³¹ÜÀíÔ±£¬ÕâÒ»²½È·±£Ã»ÓÐÓû§Ó¦ÓóÌÐòÈí¼þÔËÐУ¬±ÜÃâÐÞ¸ÄÓ²ÅÌÉϵÄÊý¾Ý¡£Èç¹ûÕâ¸ö±¸·ÝÓÃÓÚ»Ö¸´Êý¾Ý¿âϵͳ£¬ÄÇôϵ ......

Oracle Ðм¶´¥·¢Æ÷ѧϰ

 Oracle ´¥·¢Æ÷ÓÐÓï¾ä¼¶´¥·¢Æ÷ºÍÐм¶´¥·¢Æ÷
Óï¾ä¼¶´¥·¢Æ÷  µ±É¾³ý²¿ÃűíÖеIJ¿ÃźÅʱ£¬Í¬Ê±É¾³ýµôÔ±¹¤±íÖв¿ÃźÅΪ£ºold.deptnoµÄ¼Ç¼
create or replace trigger del_dept_id
after delete on dept
for each row
begin
delete from emp where deptno=:old.deptno;
end;
µ±Íù²¿Ãűí²åÈëʱ£¬Í¬Ê±ÔÚÔ±¹¤±íÖ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ