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create table users(
id number(4) primary key,
username varchar2(10),
password varchar2(10)
)
²éѯ±í²¢½âËø±í(¼´¿ÉÒÔµã»÷ÊäÈë¿òÏÂÃæµÄ"Ëø"ͼ±ê¹¤¾ß, ¼´"Edit data")
select * from users for update
ɾ³ý±íÖжàÓàµÄÁÐ
alter table mobilephone drop column mobiletype
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oracle²Ù×÷Óï¾ä£º
1.´´½¨±í
create table ±íÃû(
 ÁÐÃû1 ÀàÐÍ£¬
 ÁÐÃû2 ÀàÐÍ
);
2.ÐÞ¸ÄÀàÊôÐÔ
alter table ±íÃû modify(ÁÐÃû ÀàÐÍ);
3.Ìí¼ÓÁÐ
alter table ±íÃû add(ÁÐÃû ÀàÐÍ);
4.Ìí¼ÓÖ÷¼üÔ¼ÊøºÍ·Ç¿ÕÔ¼Êø
alter table ±íÃû add constraint pk_±íÃû primary key(ÁÐÃû);
alter table ±íÃû modify(ÁÐÃû not null);
5.ɾ³ýÖ÷¼üÔ¼Êø
alter table ±íÃû drop primary key;
alter table ±íÃû drop constraint pk_±íÃû;
6.ʧЧԼÊø
alter table ±íÃû disable primary key;
alter table ±íÃû disable constraint pk_±íÃû;
7.ÓÐЧԼÊø
alter table ±íÃû enable primary key;
alter table ±íÃû enable constraint pk_±íÃû;
8.ɾ³ýÁÐ
alter table ±íÃû drop column ÁÐÃû;
9.ÉèÖÃijÁв»¿ÉÓã¬È»ºóɾ³ý
alter table ±íÃû set unused(ÁÐÃû);
alter table ±íÃû drop unused columns;
10.Ð޸ıíÃû
rename ±íÃû1 to ±íÃû2
alter ±íÃû1 rename to ±íÃû2;
11.½Ø¶Ï±í
truncate table ±íÃû;
12.½Ø¶Ï±í±£ÁôÐпռä
truncate table ±íÃû resue storage;
13.²é¿´±í½á¹¹
desc table ±íÃû;
14.ɾ³ý±í
drop table ±íÃû;
15.²åÈë¼Ç¼
Àý£ºinsert into ±íÃû values(ÄÚÈÝ1,ÄÚÈÝ2,ÄÚÈÝ3,ÄÚÈÝ4);
16.´ø²ÎÊý¶Ô»°·½Ê½²åÈëÐÐ
Àý:insert into ±íÃû values(&ÁÐÃû1,&ÁÐÃû2);
  insert into ±íÃû values(ÄÚÈÝ1,ÄÚÈÝ2);
17.²åÈëij¼¸ÁмǼ
insert into ±íÃû(ÁÐÃû1,ÁÐÃû2) values(ÄÚÈÝ1,ÄÚÈÝ2);
18.ΪÁвåÈë¿ÕÖµ£¨ÆäÁв»ÄÜΪnot null£©
insert into ±íÃû values(ÄÚÈÝ1,null,null);
19.´´½¨±í£¨°üÀ¨Ö÷¼ü¼°Íâ¼üÉèÖã©·½·¨Ò»
create table ±íÃû(
  ÁÐÃû1 ÀàÐÍ
  constraint pk_±íÃû primary key,
  ÁÐÃû2 ÀàÐÍ not null,
  ÁÐÃû3 ÀàÐÍ 
  constraint fk_±íÃû reference ±íÃû(ÁÐÃû),
  ÁÐÃû3 ÀàÐÍ
  constraint


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