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
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 ......
ÎÒÔÚ°ÑoracleÊý¾Ýµ¼ÈësqlserverÖÐʱ£¬·¢ÏÖÔÚoracleÖÐ×ֶζ¨ÒåΪΨһË÷Òýʱ£¬²»Í¬¼Ç¼µÄ´Ë×Ö¶ÎÈç¹ûΪ¿Õ²»±»ÈÏΪÊÇÖØ¸´µÄ£¬µ«ÔÚsqlserverÖÐÈç¹û´Ë×Ö¶ÎΪΨһË÷Òý×ֶΣ¬²»ÔÊÐíÓÐ2¸öÒÔÉϵĿÕÖµ¡£ÓôÃÆ¡£ËùÒÔÖ»ºÃ½«sqlserverÖеÄΨһË÷Òý×Ö¶ÎÊÖ¹¤ÐÞ¸ÄΪ¼¸¸ö·Ç¿ÕµÄÖµ£¬µ«ÕâÑù³ÌÐò¿Ï¶¨Òª½øÐÐÐÞ¸ÄÁË¡£ÐèÒªÔÚ³ÌÐòÖÐΪ´Ë×Ö¶ÎÉèÖò»Öظ´ ......
oracle±í¿Õ¼ä²Ù×÷Ïê½â
1
2
3×÷Õߣº À´Ô´£º ¸üÐÂÈÕÆÚ£º2006-01-04
5
6
7½¨Á¢±í¿Õ¼ä
8
9CREATE TABLESPACE data01
10DATAFILE '/ora ......
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 ......