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poj 3414 Pots (bfs+路径记录)
Pots Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10071   Accepted: 4237   Special Judge Description You are given two pots, having the volume of A an...
分类:其他好文   时间:2014-10-05 17:52:28    阅读次数:193
使用GROUP BY子句进行分组操作
本文通过实例介绍GROUP BY子句的使用方法。 1 准备测试数据 新建数据表tb_Student并插入下图所示的测试数据。   图1 数据表tb_Student的数据 2 使用GROUP BY子句进行分组 问题1  要求 按照班级ID对学生进行分组,并查询出每个班级的学生数,学生的最大年龄,最小年龄,年龄总和及年龄平均等信息。 解答 SELECT s.class_id...
分类:其他好文   时间:2014-09-28 18:53:35    阅读次数:267
快速切题 poj3414 Pots
PotsTime Limit:1000MSMemory Limit:65536KTotal Submissions:10042Accepted:4221Special JudgeDescriptionYou are given two pots, having the volume ofAandBl...
分类:其他好文   时间:2014-09-25 14:18:29    阅读次数:236
poj1840Eqs【散列表】
DescriptionConsider equations having the following form:a1x13+ a2x23+ a3x33+ a4x43+ a5x53=0The coefficients are given integers from the interval [-50,...
分类:其他好文   时间:2014-09-24 22:22:47    阅读次数:298
HDU1496Equations【hash】
DescriptionConsider equations having the following form:a*x1^2+b*x2^2+c*x3^2+d*x4^2=0a, b, c, d are integers from the interval [-50,50] and any of the...
分类:其他好文   时间:2014-09-24 20:58:47    阅读次数:300
oracle中简单查询语句的格式及执行顺序分析
一条简单的查询sql格式如下: SELECT ... FROM .... [WHERE ...] --过滤单行 [GROUP BY ... [HAVING ...]]--GROUP BY对前面where条件过滤后的结果进行分组,HAVING过滤行组 [ORDER BY ...]--对结...
分类:数据库   时间:2014-09-24 10:48:26    阅读次数:239
Non-inclusive cache method using pipelined snoop bus
A non-inclusive cache system includes an external cache and a plurality of on-chip caches each having a set of tags associated therewith, with at leas...
分类:其他好文   时间:2014-09-22 16:03:22    阅读次数:220
Parallelized coherent read and writeback transaction processing system for use in a packet switched cache coherent multiprocessor system
A multiprocessor computer system is provided having a multiplicity of sub-systems and a main memory coupled to a system controller. An interconnect mo...
分类:其他好文   时间:2014-09-22 02:05:02    阅读次数:349
A multiprocessing system including an apparatus for optimizing spin-lock operations
A multiprocessing system having a plurality of processing nodes interconnected by an interconnect network. To optimize performance during spin-lock op...
分类:移动开发   时间:2014-09-22 00:56:21    阅读次数:394
mysql学习笔记 第八天
where,group by,having重新详解 where的用法: where与in的配合使用,in(值1,值2,。。。)表示结果在值1,值2,。。。其中任何一个。 聚合函数和group by的用法: 聚合函数:在有聚合函数的select 字句中,出现其他的列名是没有意义的...
分类:数据库   时间:2014-09-13 10:31:44    阅读次数:251
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