Oracle 随机获取N条数据
当我们获取数据时,可能会有这样的需求,即每次从表中获取数据时,是随机获取一定的记录,而不是每次都获取一样的数据,这时我们可以采取Oracle内部一些函数,来达到这样的目的1)
select * from (select * from tablename order b...
分类:
数据库 时间:
2014-07-22 23:16:15
阅读次数:
434
A quarry operator in the Libyan needed to
expand their crushing and screening plant in order to cope with an increase in
chip and sand demand from the...
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其他好文 时间:
2014-04-30 20:26:27
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646
题目: You are given two linked lists representing two
non-negative numbers. The digits are stored in reverse order and each of their
nodes contain a sin...
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其他好文 时间:
2014-04-30 18:44:23
阅读次数:
428
前几天同学让我帮忙调试一个PHP后台的网站,我擦,我都没有环境你丫还非得让我本地跑,不肯给我权限。我只想说三个字,你丫就是王八蛋。希望你看不到我写的这篇文章。now,吐槽结束,正题开始。下面介绍快速搭建一个PHP开发环境搭建的小技巧。no
big deal,就是一个开源的软件。名字是PHPnow。它...
分类:
Web程序 时间:
2014-04-29 22:21:25
阅读次数:
669
A LiveJournal course of developmentis a project
in the 99 years began in the campus, a few people do as a hobby such an
application, in order to achie...
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其他好文 时间:
2014-04-29 19:38:16
阅读次数:
589
Given a matrix ofmxnelements (mrows,ncolumns),
return all elements of the matrix in spiral order.For example,Given the
following matrix:[ [ 1, 2, 3 ],...
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其他好文 时间:
2014-04-29 10:37:46
阅读次数:
434
You are given two linked lists representing two
non-negative numbers. The digits are stored in reverse order and each of their
nodes contain a single ...
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其他好文 时间:
2014-04-29 10:17:46
阅读次数:
406
oracle认为 null 最大。 升序排列,默认情况下,null值排后面。
降序排序,默认情况下,null值排前面。(1)用nvl函数或decode函数将null转换为一特定值 替换null:
nvl(arg,value)(2)用case语法将null转换为一特定值: order by (ca.....
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其他好文 时间:
2014-04-28 01:06:19
阅读次数:
554
//: ORDER.CPP -- Order of constructor calls // with
inheritance#include #define inherit(derived, base) \class derived : public base
{ \public: \ deri....
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其他好文 时间:
2014-04-28 00:09:24
阅读次数:
444