SQL常用语句

create table picdd  (ddid  INTEGER not null,pid integer not null,name VARCHAR2(50) not null,constraint PK_picdd primary key (pid))

DROP TABLE picdd

create index table_1_fk on table (id ASC)

alter table pictest(表名) add piccc(字段名) varchar(50) default 0(默认值为0) not null(不能为空)  

 在oracle中not null需要放在default中

alter table pictest(表名) drop column  piccc(字段名)

CREATE SEQUENCE pic_Sequence
 INCREMENT BY 1  
     START WITH 1     
     NOMAXVALUE      
     NOCYCLE         
     CACHE 10; 

CREATE TRIGGER pic BEFORE
insert ON  pic FOR EACH ROW
begin
select pic_Sequence.nextval into:New.picid from dual;

end;

select * from table where id='1';

uodate  table  set name='赵永恩'  where id='2';

insert into  table(id,name) values('2','赵永恩吗');

delete from table  where id='1';

create OR replace view v_qikan_2011(title,msg) AS SELECT  qikan.title , qikan.msg from qikan