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ÀýÈç±í£ºstudent(ѧÉú)±í£¬±í½á¹¹Îª£º
ID¡¡¡¡¡¡    char(6)¡¡¡¡¡¡¡¡¡¡ --ѧºÅ
name¡¡¡¡¡¡¡¡VARCHAR2(10)¡¡¡¡¡¡--ÐÕÃû
create table student (ID char(6), name VARCHAR2(100));
insert into sale values('200001',‘ÕÅÒ»’);
insert into sale values('200002',‘Íõ¶þ’);
insert into sale values('200003',‘ÀîÈý’);
insert into sale values('200004',‘ÕÔËÄ’);
commit;
(1) rownum ¶ÔÓÚµÈÓÚijֵµÄ²éѯÌõ¼þ
Èç¹ûÏ£ÍûÕÒµ½Ñ§Éú±íÖеÚÒ»ÌõѧÉúµÄÐÅÏ¢£¬¿ÉÒÔʹÓÃrownum=1×÷ΪÌõ¼þ¡£µ«ÊÇÏëÕÒµ½Ñ§Éú±íÖеڶþÌõѧÉúµÄÐÅÏ¢£¬Ê¹ÓÃrownum=2½á¹û²é²»µ½Êý¾Ý¡£ÒòΪrownum¶¼ÊÇ´Ó1¿ªÊ¼£¬µ«ÊÇ1ÒÔÉϵÄ×ÔÈ»ÊýÔÚrownum×öµÈÓÚÅжÏÊÇʱÈÏΪ¶¼ÊÇfalseÌõ¼þ£¬ËùÒÔÎÞ·¨²éµ½rownum = n£¨n>1µÄ×ÔÈ»Êý£©¡£
SQL> select rownum,id,name from student where rownum=1;£¨¿ÉÒÔÓÃÔÚÏÞÖÆ·µ»Ø¼Ç¼ÌõÊýµÄµØ·½£¬±£Ö¤²»³ö´í£¬È磺ÒþʽÓα꣩
SQL> select rownum,id,name from student where rownum=1;
    ROWNUM ID     NAME
---------- ------ ---------------------------------------------------
         1 200001 ÕÅÒ»
SQL> select rownum,id,name from student where rownum =2;
    ROWNUM ID     NAME
---------- ------ ---------------------------------------------------
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   Èç¹ûÏëÕÒµ½´ÓµÚ¶þÐмǼÒÔºóµÄ¼Ç¼£¬µ±Ê¹ÓÃrownum>2ÊDz鲻³ö¼Ç¼µÄ£¬Ô­ÒòÊÇÓÉÓÚrownumÊÇÒ»¸ö×ÜÊÇ´Ó1¿ªÊ¼µÄαÁУ¬Oracle ÈÏΪrownum> n(n>1µÄ×ÔÈ»Êý)ÕâÖÖÌõ¼þÒÀ¾É²»³ÉÁ¢£¬ËùÒԲ鲻µ½¼Ç¼
SQL> select rownum,id,name from student where rownum >2;
ROWNUM ID     NAME
---------- ------ ---------------------------------------------------
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