ORACLE Rank, Dense_rank, row_number
Ŀ¼
======================================================
1.ʹÓÃrownumΪ¼Ç¼ÅÅÃû
2.ʹÓ÷ÖÎöº¯ÊýÀ´Îª¼Ç¼ÅÅÃû
3.ʹÓ÷ÖÎöº¯ÊýΪ¼Ç¼½øÐзÖ×éÅÅÃû
Ò»¡¢Ê¹ÓÃrownumΪ¼Ç¼ÅÅÃû£º
¡¾1¡¿²âÊÔ»·¾³£º
SQL> desc user_order;
Name Null? Type
----------------------------------------- -------- ----------------------------
REGION_ID NUMBER(2)
CUSTOMER_ID NUMBER(2)
CUSTOMER_SALES NUMBER
¡¾2¡¿²âÊÔÊý¾Ý£º
SQL> select * from user_order order by customer_sales;
REGION_ID CUSTOMER_ID CUSTOMER_SALES
---------- ----------- --------------
5 1 151162
10 29 903383
6 7 &nb
Ïà¹ØÎĵµ£º
ÓÉÓÚϵͳÒÆÖ²£¬ÔÀ´µÄÊý¾Ý¿â±àÂëºÍʱÇø¶¼»»ÁË£¬ÔÀ´µÄһЩSQLÎÄÒ²³ö´íÁË¡£¡£
¾³£±À³ö"ORA-01846: not a valid day of the week
"´íÎó¡£
¾²âÊÔ£¬ÒÔÏÂÕâ¸ö¼òµ¥Óï¾äÒ²»á´í£¡£¡
SQL> select next_day(sysdate,'FRIDAY') from DUAL;
select next_day(sysdate,'FRIDAY') from DUAL
ORA-01 ......
1. round(Num,n) : ËÄÉáÎåÈëÊý×ÖNum£¬±£ÁônλСÊý£¬²»Ð´NĬÈϲ»ÒªÐ¡Êý£¬ËÄÉáÎåÈëµ½ÕûÊý¸öλ
select ROUND(21.237,2) from dual;
½á¹û£º 21.24
2. trunc(Num,n) : ½ØÈ¡Êý×ÖNum£¬±£ÁônλСÊý£¬²»Ð´NĬÈÏÊÇ0£¬¼´²»ÒªÐ¡Êý
select TRUNC(21.237,2) from dual;
½á¹û£º21.2 ......
1.µÃµ½Ò»¸ö±íµÄddlÓï¾ä£º
SET SERVEROUTPUT ON
SET LINESIZE 1000
SET FEEDBACK OFF
set long 999999 ------ÏÔʾ²»ÍêÕû
SET PAGESIZE 1000 ----·ÖÒ³
EXECUTE DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.S ......
OracleÖ÷¼ü×Ô¶¯Ôö³¤
Õ⼸Ìì¸ãOracle£¬ÏëÈñíµÄÖ÷¼üʵÏÖ×Ô¶¯Ôö³¤£¬²éÍøÂçʵÏÖÈçÏ£º
create table simon_example
(
id number(4) not null primary key,
name varchar2(25)
)
-- ½¨Á¢ÐòÁУº
-- Create sequence
create sequence SIMON_SEQUENCE &nb ......
ÔÎļûhttp://blog.csdn.net/kele1121/archive/2009/10/30/4742051.aspxÓëhttp://www.itpub.net/thread-1105403-1-1.html
Ëùν
Oracle
µÄÌåϵ¼Ü¹¹£¬ÊÇÖ¸
Oracle
Êý¾Ý¿â¹ÜÀíϵͳµÄµÄ×é³É²¿·ÖºÍÕâЩ×é³É²¿·ÖÖ®¼äµÄÏ໥¹Øϵ£¬°üÀ¨
ÄÚ´æ½á¹¹¡¢ºǫ́½ø³Ì¡¢ÎïÀíÓëÂß¼½á¹¹µÈ¡£
Oracle
Êý¾Ý¿âµÄÌåϵºÜ¸´ÔÓ£¬¸´Ô ......