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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´ØɨÃèµÄ·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 AN
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