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create or replace directory exp_dir as '/tmp';
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grant read, write on directory exp_dir to eygle;
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Oracle ÌṩÁ½ÖÖ·ÃÎÊÇý¶¯: ORACLE_LOADER, ORACLE_DATAPUMP(oracle 10.2ºóÐÂÔöµÄÇý¶¯)
ORACLE_LOADER:    ËüÀûÓÃoracle loader¼¼Êõ´ÓÍⲿ±í¶ÁÈ¡Êý¾Ý. Ëü»¹¾ßÓÐÀàËÆSQL*Loader¹¤¾ß¿ØÖÆÎļþÓï·¨µÄÊý¾ÝÓ³ÉäÄÜÁ¦.
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     select * from(
  select count(t1.xh) as xhs,t2.uuid,t3.xm as xsxm,t3.sfzjh, t1.xjzt as xjzt from hust_xs_jb t1
   INNER JOIN hust_xx_identity t2 on t1.sfid ......
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