SQLÓÅ»¯¹ý³ÌÖг£¼ûOracle HINTµÄÓ÷¨
ÔÚSQLÓï¾äÓÅ»¯¹ý³ÌÖУ¬ÎÒÃǾ³£»áÓõ½hint,ÏÖ×ܽáÒ»ÏÂÔÚSQLÓÅ»¯¹ý³ÌÖг£¼ûOracle HINTµÄÓ÷¨£º
1. /*+ALL_ROWS*/
±íÃ÷¶ÔÓï¾ä¿éÑ¡Ôñ»ùÓÚ¿ªÏúµÄÓÅ»¯·½·¨,²¢»ñµÃ×î¼ÑÍÌÍÂÁ¿,ʹ×ÊÔ´ÏûºÄ×îС»¯.
ÀýÈç:
SELECT /*+ALL+_ROWS*/ EMP_NO,EMP_NAM,DAT_IN from BSEMPMS WHERE EMP_NO='SCOTT';
2. /*+FIRST_ROWS*/
±íÃ÷¶ÔÓï¾ä¿éÑ¡Ôñ»ùÓÚ¿ªÏúµÄÓÅ»¯·½·¨,²¢»ñµÃ×î¼ÑÏìӦʱ¼ä,ʹ×ÊÔ´ÏûºÄ×îС»¯.
ÀýÈç:
SELECT /*+FIRST_ROWS*/ EMP_NO,EMP_NAM,DAT_IN from BSEMPMS WHERE EMP_NO='SCOTT';
3. /*+CHOOSE*/
±íÃ÷Èç¹ûÊý¾Ý×ÖµäÖÐÓзÃÎʱíµÄͳ¼ÆÐÅÏ¢,½«»ùÓÚ¿ªÏúµÄÓÅ»¯·½·¨,²¢»ñµÃ×î¼ÑµÄÍÌÍÂÁ¿;
±íÃ÷Èç¹ûÊý¾Ý×ÖµäÖÐûÓзÃÎʱíµÄͳ¼ÆÐÅÏ¢,½«»ùÓÚ¹æÔò¿ªÏúµÄÓÅ»¯·½·¨;
ÀýÈç:
SELECT /*+CHOOSE*/ EMP_NO,EMP_NAM,DAT_IN from BSEMPMS WHERE EMP_NO='SCOTT';
4. /*+RULE*/
±íÃ÷¶ÔÓï¾ä¿éÑ¡Ôñ»ùÓÚ¹æÔòµÄÓÅ»¯·½·¨.
ÀýÈç:
SELECT /*+ RULE */ EMP_NO,EMP_NAM,DAT_IN from BSEMPMS WHERE EMP_NO='SCOTT';
5. /*+FULL(TABLE)*/
±íÃ÷¶Ô±íÑ¡ÔñÈ«¾ÖɨÃèµÄ·½·¨.
ÀýÈç:
SELECT /*+FULL(A)*/ EMP_NO,EMP_NAM from BSEMPMS A WHERE EMP_NO='SCOTT';
6. /*+ROWID(TABLE)*/
ÌáʾÃ÷È·±íÃ÷¶ÔÖ¸¶¨±í¸ù¾ÝROWID½øÐзÃÎÊ.
ÀýÈç:
SELECT /*+ROWID(BSEMPMS)*/ * from BSEMPMS WHERE ROWID>='AAAAAAAAAAAAAA'
AND EMP_NO='SCOTT';
7. /*+CLUSTER(TABLE)*/
ÌáʾÃ÷È·±íÃ÷¶ÔÖ¸¶¨±íÑ¡Ôñ´ØÉ¨ÃèµÄ·ÃÎÊ·½·¨,ËüÖ»¶Ô´Ø¶ÔÏóÓÐЧ.
ÀýÈç:
SELECT /*+CLUSTER */ BSEMPMS.EMP_NO,DPT_NO from BSEMPMS,BSDPTMS
WHERE DPT_NO='TEC304' AND BSEMPMS.DPT_NO=BSDPTMS.DPT_NO;
8. /*+INDEX(TABLE INDEX_NAME)*/
±íÃ÷¶Ô±íÑ¡ÔñË÷ÒýµÄɨÃè·½·¨.
ÀýÈç:
SELECT /*+INDEX(BSEMPMS SEX_INDEX) USE SEX_INDEX BECAUSE THERE ARE FEWMALE BSEMPMS */ from BSEMPMS WHERE SEX='M';
9. /*+INDEX_ASC(TABLE INDEX_NAME)*/
±íÃ÷¶Ô±íÑ¡ÔñË÷ÒýÉýÐòµÄɨÃè·½·¨.
ÀýÈç:
SELECT /*+INDEX_ASC(BSEMPMS PK_BSEMPMS) */ from BSEMPMS WHERE DPT_NO='SCOTT';
10. /*+INDEX_COMBINE*/
Ϊָ¶¨±íÑ¡Ôñλͼ·ÃÎÊ·¾,Èç¹ûINDEX_COMBINEÖÐûÓÐÌṩ×÷Ϊ²ÎÊýµÄË÷Òý,½«Ñ¡Ôñ³öλͼË÷ÒýµÄ²¼¶û×éºÏ·½Ê½.
ÀýÈç:
SELECT /*+INDEX_COMBINE(BSEMPMS SAL_BMI HIREDATE_BMI)*/ * from BSEMPMS
WHERE SAL <5000000 AND HIREDATE <SYSDATE;
11. /*+INDEX_JOIN(TA
Ïà¹ØÎĵµ£º
1. >>¼ÓÃÜ
from the Books Online:
Use the WITH ENCRYPTION option:
IF EXISTS (SELECT name from sysobjects
WHERE name = 'encrypt_this' AND type = 'P')
DROP PROCEDURE encrypt_this
GO
USE pubs
GO
CREATE PROCEDURE encrypt_this
WITH ENCRYPTION
AS
SELECT *
from authors
GO
EXEC sp ......
LIKEºÍͨÅä·û
©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥©¥
È·¶¨¸ø¶¨µÄ×Ö·û´®ÊÇ·ñÓëÖ¸¶¨µÄģʽƥÅ䡣ģʽ¿ÉÒÔ°üº¬³£¹æ×Ö·ûºÍͨÅä·û×Ö·û¡£Ä£Ê½Æ¥Åä¹ý³ÌÖУ¬³£¹æ×Ö·û±ØÐëÓë×Ö·û´®ÖÐÖ¸¶¨µÄ×Ö·ûÍêȫƥÅ䡣Ȼ¶ø£¬¿ÉʹÓÃ×Ö·û´®µÄÈÎÒâÆ¬¶ÎÆ¥ÅäͨÅä·û¡£ÓëʹÓÃ
= ºÍ != ×Ö·û´®±È½ÏÔËËã·ûÏà±È£¬Ê¹ÓÃͨÅä·û¿Éʹ LIKE ÔËË ......
from£º http://www.javaeye.com/topic/498902?page=1
×î½ü´ÓÅóÓÑÄÇ¿´ÁËÒ»¸öij×Éѯ¹«Ë¾¸øÒ»¼ÒÆóÒµ×öµÄÒ»¸öÓÅ»¯ÏîÄ¿µÄ×ܽᱨ¸æÊ飬ÆäÀúʱÁ½¸öÔ£¬10Íò·ÑÓã¬4¸öÈË¡£
×îÖÕ½á¹ûÊÇÐÔÄܺÍÏàÓ¦ÌáÉýÁË30%£¬×ܹ²ÐÞ¸ÄÁË3ÐдúÂëºÍÅäÖ㬹²ÐÞ¸ÄÁË3¸öµ¥´Ê£¬²»µ½20¸ö×Öĸ~~~~¡£
ÅóÓÑ×ܽáÁËÒ»¾ä»°£¬¾ÍÊÇ“´úÂëÖÊÁ¿Ô½ÀõÄÏîÄ¿ ......
int object_id('objectname');
´Ë·½·¨·µ»ØÊý¾Ý¿â¶ÔÏó±êʶºÅ¡£
ÆäÖУ¬²ÎÊýobjectname ±íʾҪʹÓõĶÔÏ󣬯äÊý¾ÝÀàÐÍΪnchar»òchar£¨Èç¹ûΪchar£¬ÏµÍ³½«Æäת»»Îªnchar£©
·µ»ØÀàÐÍΪint£¬±íʾ¸Ã¶ÔÏóÔÚϵͳÖеıàºÅ¡£
±ÈÈ磺
use wf_timesheet
select object_id('usp_check_excess_hours')
·µ»ØÎª197575742¡£
´Ë· ......
´ÓAccessÊý¾Ý¿âµ¼Èëµ½SQL
·½·¨Ò»:
ÔÚMSsqlÖÐÒª¼òÀúODBC..·½·¨±È½Ï±¿µã..
·½·¨¶þ:
Ö±½Ó´ÓAccessÉýǨµ½MSsql..
ÒòΪAccessÊý¾Ý¿âÓÐÉèÖÃÃÜÂë..»¹Õæ²»ºÃ¸ã..¸ãÁ˺ü¸´Î¶¼Ê§°ÜÁË..
ÀûÓ÷½·¨¶þ..Ò»´Î³É¹¦..
ÓÃÊý¾Ý¿âÉýǨ...¼òµ¥...
½¨ÒéʹÓõڶþÖÖ·½·¨µ¼ÈëACCESSÊý¾Ý¿âµ½MSSQLÊý¾Ý¿âÖÐ..Ê¡ÊÂ!!! ......