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Union All£¬¶ÔÁ½¸ö½á¹û¼¯½øÐв¢¼¯²Ù×÷£¬°üÀ¨Öظ´ÐУ¬²»½øÐÐÅÅÐò£»
Intersect£¬¶ÔÁ½¸ö½á¹û¼¯½øÐн»¼¯²Ù×÷£¬²»°üÀ¨Öظ´ÐУ¬Í¬Ê±½øÐÐĬÈϹæÔòµÄÅÅÐò£»
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¿ÉÒÔÔÚ×îºóÒ»¸ö½á¹û¼¯ÖÐÖ¸¶¨Order by×Ó¾ä¸Ä±äÅÅÐò·½Ê½:
select score,id,name
from student
where id > 2 and id < 7
union
select score,id,name
from student
where id < 4
union
select score,id,name
from student
where id > 8
order by id desc


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select segment_name, bytes
from user_segments
where segment_type = 'TABLE';
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   Select Segment_Name,Sum(bytes)/1024/1024 from User_Extents Group By Segment_Name
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Oracle OFS FS10755 ±¨´íÎÊÌâµÄ½â¾ö·½·¨


Oracle OFS FS10755 ±¨´íÎÊÌâµÄ½â¾ö·½·¨
 
 
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Oracle OFS error - FS10755: Error Creating the OracleFsWorker COM object After Oracle OFS installed, the verification could not pa ......

oracle ±Ê¼Ç III Ö®´æ´¢¹ý³ÌÓ뺯Êý

DML(Manipulation):Êý¾Ý²Ù×÷ÓïÑÔ
CRUD
DDL(Definition): Êý¾Ý¶¨ÒåÓïÑÔ,Óë±í£¬Ë÷Òý£¬Í¬Òå´ÊÓйØ
create,alter,drop,rename,truncate(Çå¿Õ)
DCL(Control): Êý¾Ý¿ØÖÆÓïÑÔ£¬ÓëȨÏÞÓйØ
grant,revoke
TCL(Transaction Control): ÊÂÎñ¿ØÖÆÓïÑÔ,ÓëÊÂÎñÓйØ
commit,rollback,savepoint
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Oracle ²ÎÊýÎļþ×ܽá

1:pfileºÍspfile
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Oracle³£ÓÃSqlÓï¾ä

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CREATE OR REPLACE VIEW SM_V_UNIT_AUTH AS
SELECT T2.UNIT_ID,
        T2.SUPER_UNIT_ID,
        T1.AUTH_ID,
        T1.AUTH_NAME,
        T1.A ......
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