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Union All£¬¶ÔÁ½¸ö½á¹û¼¯½øÐв¢¼¯²Ù×÷£¬°üÀ¨Öظ´ÐУ¬²»½øÐÐÅÅÐò£»
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Minus£¬¶ÔÁ½¸ö½á¹û¼¯½øÐвî²Ù×÷£¬²»°üÀ¨Öظ´ÐУ¬Í¬Ê±½øÐÐĬÈϹæÔòµÄÅÅÐò¡£
¿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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Oracleɾ³ýÖظ´Ðд«ÖDz¥¿Í

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1¡¢²éÕÒ±íÖжàÓàµÄÖظ´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ýµ¥¸ö×ֶΣ¨peopleId£©À´ÅжÏ
select * from people
where peopleId in (select   peopleId from   people group by   peopleId having count(peopleId) > 1)
2¡¢É¾³ý±íÖжàÓàµÄÖظ´¼Ç¼£¬Öظ´¼Ç¼ÊǸù¾Ý ......

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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1)pfileÊÇÎı¾Îļþ£¬spfileÊǶþ½øÖÆÎļþ£»
2)¶ÔÓÚ²ÎÊýµÄÅäÖã¬pfile¿ÉÒÔÖ±½ÓÒÔÎ ......

Oracle³£ÓÃSqlÓï¾ä

1. ´´½¨ÊÓͼ£º
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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