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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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Oracle Stream Replication¼¼Êõ


Stream ÊÇOracle µÄÏûÏ¢¶ÓÁÐ(Ò²½ÐOracle Advanced Queue)¼¼ÊõµÄÒ»ÖÖÀ©Õ¹Ó¦ÓᣠOracle µÄÏûÏ¢¶ÓÁÐÊÇͨ¹ý·¢²¼/¶©Ôĵķ½Ê½À´½â¾öʼþ¹ÜÀí¡£Á÷¸´ÖÆ(Stream replication)Ö»ÊÇ»ùÓÚËüµÄÒ»¸öÊý¾Ý¹²Ïí¼¼Êõ£¬Ò²¿ÉÒÔ±»ÓÃ×÷Ò»¸ö¿ÉÁé»î¶¨ÖƵĸ߿ÉÓÃÐÔ·½°¸¡£ Ëü¿ÉÒÔʵÏÖÁ½¸öÊý¾Ý¿âÖ®¼äÊý¾Ý¿â¼ ......

Oracle ²ÎÊýÎļþ×ܽá

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