表空間創建表空間SQL> create tablespace emp 2 logging 3 datafile '/Oracle/oradata/dba/emp.dbf' size 5M extent 4 management local；增加表空間大小SQL> alter tablespace emp 2 add datafile '/oracle/oradata/dba/emp_1.dbf' size 3M;刪除表空間SQL> drop tablespace emp including contents;2 創建用戶create user jackylau identified by richie default tablespace emp temporarytablespace temp quota 15m on emp passWord eXPire;授權用戶grant dba to jackylau with admin option;alter user jackylau default role all;修改用戶密碼alter user jackylau identified by richie表創建表SQL> create table QQ 2 (name varchar(20), 3 id number(10), 4 relation varchar(6), 5 gender varchar(4)6 );從其它表中建表create table temp as select name,id from qq;重新命名一個表名rename qq to qqtest查看一個表的結構desc table_name;插入記錄insert into qq (name,id,relation,gender) values ('寶兒','33796776','朋友','女');insert into qq values ('寶兒','33796776','朋友','女');修改記錄 update qq set name='apple' where id = '371692320';把id號為371692320的項為name所在的名改為apple更改列的字符大小alter table qq modify (gender varchar(6));增加列alter table qq add time date;刪除列alter table qq set unused ("TIME") cascade constraints;(注重TIME要大寫)刪除內容truncate table qq drop storage;(截掉,不可恢復)查詢select * from qq;select id from qq where id='18243386';select * from qq where gender='女' order by name;select * from qq where id like '%8%' order by name;刪除記錄SQL> delete from qq 2 where id='18243386';回滾消除上一個COMMIT命令后的所做的全部修改,使得數據庫的內容恢復到上一個COMMIT執行后的狀態.使用方法是: SQL>rollback; LINK那個字段 LIKE "字符組合"字符組合 可以是固定字符 與 % 和 _ 的隨意組合，其中 % 代表任意長度的任意字符，_ 代表單個字符where name like 'jacky___' 能查到 jackylau 卻不能查到 jackylau+where name like '%acky___' 能查到 jackylau, abcackylau 卻不能查到 jackylausomewordSQL> edit s<回車>假如當前目錄下不存在s.sql文件，則系統自動生成s.sql文件，在其中輸入“select * from tab;”，存盤退出。
SQL> @s<回車>創建用戶并授權SQL> create user 用戶1 identified by 密碼;
SQL> grant connect,resource to 用戶1;
SQL> connect 用戶1/密碼
SQL> create table 表1(列1 number,列2 date);
SQL> create index 索引1 on 表1(列1);
SQL> drop index 索引1;
SQL> drop table 表1;創建視圖Create or replace view testview as select col1,col2,col3 from table_name;create view test_view as select name,id,gender from qq;select * from test_view;create view qqtest as select name,id,relation lation from qq where id>100000000;(并重新命名relation列為lation)create view qqtest as select name,id,gender from qq where id>100000000 with read only;創建序列CREATE SEQUENCE inc_hourdiscount INCREMENT BY 1 START WITH 1 MAXVALUE 1.0E28;查看數據庫show parameter db_name;select name from v$database;如何單獨備份一個或多個用戶？exp system/manager owner=(用戶1,用戶2,…,用戶n) file=導出文件如何單獨備份一個或多個表？exp 用戶/密碼 tables=(表1,
…,表2)
