oracle  ORDER SIBLINGS BY...
                            
                            
                                分类:
数据库   时间:
2014-05-10 08:35:30   
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356
                             
                         
                    
                        
                            
                            
                                You should initialize most fields normally, not 
lazily. If you must initialize a field lazily in order to achieve your 
performance goals, or to break ...
                            
                            
                                分类:
编程语言   时间:
2014-05-09 18:32:56   
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497
                             
                         
                    
                        
                            
                            
                                A heap is a partially sorted binary tree. 
Although a heap is not completely in order, it conforms to a sorting principle: 
every node has a value less ...
                            
                            
                                分类:
其他好文   时间:
2014-05-09 17:34:18   
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339
                             
                         
                    
                        
                            
                            
                                SELECT * FROM (SELECT * FROM calenderDetail A ORDER 
BY a. calender desc ) WHERE rownum <3 
;//计算时间大于当前时间的最近2条记录取当前小时,以及相隔一小时v_begin_date:=to_date(to_ch...
                            
                            
                                分类:
数据库   时间:
2014-05-09 17:03:41   
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620
                             
                         
                    
                        
                            
                            
                                select * from ( select row_number() over(order 
by BD008_001) as row ,* from ...
                            
                            
                                分类:
数据库   时间:
2014-05-09 16:56:57   
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328
                             
                         
                    
                        
                            
                            
                                在MySQL中的ORDER 
BY有两种排序实现方式:1、利用有序索引获取有序数据2、文件排序在使用explain分析查询的时候,利用有序索引获取有序数据显示Using 
index。而文件排序显示Using filesort。1.利用有序索引获取有序数据取出满足过滤条件作为排序条件的字段,以及可以直接...
                            
                            
                                分类:
数据库   时间:
2014-05-08 19:47:21   
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572
                             
                         
                    
                        
                            
                            
                                Given an array with n objects colored red, 
white or blue, sort them so that objects of the same color are adjacent, with 
the colors in the order red, ...
                            
                            
                                分类:
其他好文   时间:
2014-05-07 18:01:05   
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412
                             
                         
                    
                        
                            
                            
                                一、逻辑查询处理的各个阶段
(5)SELECT DISTINCT TOP()                       
(1)FROM   JOIN  ON  
(2)WHERE 
(3)GROUP BY 
(4)HAVING 
(6)ORDER BY 
上边语句是一个普通格式的查询语句,基本包含了所有的查询条件和关键字。你可能会发现前边的序号并不是按顺序来的,被你说对了,这...
                            
                            
                                分类:
数据库   时间:
2014-05-07 08:26:11   
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476
                             
                         
                    
                        
                            
                            
                                Problem Description
You are given a sequence of n integers a1 , a2 , ... , an in non-decreasing order. In addition to that, you are given several queries consisting of indices i and j (1 ≤ i ≤ j ≤ ...
                            
                            
                                分类:
其他好文   时间:
2014-05-07 07:59:11   
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309
                             
                         
                    
                        
                            
                            
                                SQL SERVER命令总结
查询语句:
SELECT [ALL/DISTINCT][TOP] 
    [as 别名][, as 别名]…
FROM [as 别名]…
[WHERE 条件表达式…]
[GROUP BY [HAVING]]
[ORDER BY[ASC/DESC]] 
应该注意:SELECT语句的顺序:
SELECT-->FROM-->WHERE-->GROUP B...
                            
                            
                                分类:
数据库   时间:
2014-05-07 04:32:52   
                                阅读次数:
561