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select id,orgid,dj_date,khid,khcode,khname,feeid from fee_ysfy;
--493408
select count(id) from fee_ysfy;
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select id, orgid, dj_date, khid, khcode, khname, feeid
  from (select rownum rn, t.id, orgid, dj_date, khid, khcode, khname, feeid
          from fee_ysfy t
         where 1 = 1
         order by id desc)
 where rn <= 45
   and rn >= 30
 order by id desc
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 select id, orgid, dj_date, khid, khcode, khname, feeid
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          from fee_ysfy t
         where 1 = 1
         order by id desc)
 where rn <= 45
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select id, orgid, dj_date, khid, khcode, khname, feeid
  from (select rownum rn, t.id, orgid, dj_date, khid, khcode, khname, feeid
          from fee_ysfy t
         where 1 = 1
         )
 where rn <= 45
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select id, orgid, dj_date, khid, khcode, khname, fee


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ORACLE:Ö÷¼üË÷Òý¸ü»»±í¿Õ¼ä

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   alter index index_aaa rebuild tablespace newtablespace;
newtablespace ÊÇÐÂÖ¸¶¨µÄ±í¿Õ¼ä¡£ ......

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select (1-(sum(decode(name, 'physical reads',value,0))/(sum(decode(name, 'db block gets',value,0))
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select distinct name from t1 ÄÜÏû³ýÖظ´¼Ç¼£¬µ«Ö»ÄÜÈ¡Ò»¸ö×ֶΣ¬ÏÖÔÚҪͬʱȡid,nameÕâ2¸ö×ֶεÄÖµ¡£
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Oracle Date Function ½²½âºÍÊÂÀý

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1 year=1*12 months
1 day=24
hours=24*(1*60mins)=24*60*(1*60 seconds)
1 week =7 days
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