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OracleÖÐΪʲôwhere rownum > 3 ²éÕÒ²»µ½Êý¾Ý£¿

²éѯ±íempÖÐËùÓÐÊý¾Ý
select emp_id,rownum from emp
µÚÒ»²½£¬²éѯ½á¹û,rownum´ý¶¨
emp_id rownum
1         ?   1
2         ?   2
3         ?   3
4         ?
µÚ¶þ²½£¬ÏÖÔÚ¼ÙÉèÓÃrownum < 3µÄÌõ¼þÀ´¹ýÂË
µÚÒ»ÐУ¬rownum³õʼ·ÖÅäΪ1£¬Âú×ãrownum <3µÄÌõ¼þ£¬È»ºórownum¼Ó1
µÚ¶þÐУ¬rownumÏÖÔÚΪ2,Âú×ã < 3µÄÌõ¼þ,È»ºórownum¼Ó1
.....
µÚ¶þ²½£¬ÏÖÔÚ¼ÙÉèÓà rownum > 2µÄÌõ¼þÀ´¹ýÂË
ÏÖÔÚ¿´µÚÒ»ÐУ¬rownum³õʼ·ÖÅäΪ1£¬ ²»Âú×ãrownum>2µÄÌõ¼þ,rownum²»»á¼Ó1
µÚ¶þÐУ¬rownum»¹ÊÇ1£¬Í¬Ñù²»Âú×ã>2µÄÌõ¼þ
....
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    select * from
               (select t.*,rwonum rn
              from emp t
               where rownum < 5 )
       where rn > 3


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select * from v$version;
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select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
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oracleÅж϶ÔÏóÊÇ·ñ´æÔÚ

declare    
    v_isexist number(3,0):=0;  
begin  
    select count(1) into v_isexist from sys.all_objects where owner = 'TEST' and object_type = 'TABLE' and object_name = 'TAB1';
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OracleÊý¾Ý¿â»¹Õæ²»ºÃÕû

´ÓÔÚLinuxÉϰ²×°Oracleµ½Í¶ÈëʹÓòż¸Ì죬Åöµ½µÄÎÊÌâ¾Í³É°ÙÉÏǧµÄ¡£ÔÚʹÓÿͻ§¶ËÁ¬½ÓÔ¶³ÌOracleÊý¾Ý¿â·þÎñÆ÷ʱ£¬³öÏÖÁËlistener refused the connection with the following error ora-12519 Listener refused the connection with the following error:ORA-12519, TNS:no appropriate service handler foundThe Connection ......
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