I am lucky enough to work with a small team of fantastic engineers who truly care about their customers. If you are not that lucky, this letter is for...
                            
                            
                                分类:
其他好文   时间:
2014-11-17 15:39:15   
                                阅读次数:
158
                             
                         
                    
                        
                            
                            
                                比如在Northwind数据库中有一个查询为
SELECT c.CustomerId,CompanyName FROM Customers c
WHERE EXISTS(
SELECT OrderID FROM Orders o WHERE o.CustomerID=c.CustomerID) 
这里面的EXISTS是如何运作呢?子查询返回的是OrderId字段,可是外面的查询要找的是Cu...
                            
                            
                                分类:
数据库   时间:
2014-11-14 09:19:20   
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182
                             
                         
                    
                        
                            
                            
                                The customers got the shared memory 80error on AIX environment; utility truss is used to track the debug info,eXtremeDB.registry access error is found.  Release notesdescribed as follows: These names ...
                            
                            
                                分类:
数据库   时间:
2014-11-10 10:00:31   
                                阅读次数:
237
                             
                         
                    
                        
                            
                            
                                1.Primacyandrecency:Peoplemostrememberthefirstandlastthingstooccur,andbarelythemiddle.Whenschedulinganinterview,askwhattimestheemployerisinterviewingandtrytobefirstorlast.2.Ifyouworkinabarorincustomerserviceofanykind……Putamirrorbehindyouatthecounter.Thisw..
                            
                            
                                分类:
其他好文   时间:
2014-10-24 11:11:47   
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374
                             
                         
                    
                        
                            
                            
                                1. Customers.xml 1 2 4 5 John 6 Cranston 7 (445) 269-9857 8 9 10 11 Annie12 Loskar13 ...
                            
                            
                         
                    
                        
                            
                            
                                比如在Northwind数据库中 有一个查询为 SELECT c.CustomerId, CompanyName FROM Customers c WHERE EXISTS( SELECT OrderID FROM O...
                            
                            
                                分类:
数据库   时间:
2014-10-20 11:27:38   
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285
                             
                         
                    
                        
                            
                            
                                一、如何定义关联
    两个model之间常常会存在关联关系,为了解决这些关联引起的复杂操作问题,可以在model定义时定义其关联关系。如:实体customers和orders定义如下:
class 
Customer 
  has_many
:orders, dependent:
:destroy
end
  
class 
Order...
                            
                            
                                分类:
其他好文   时间:
2014-10-16 14:55:32   
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152
                             
                         
                    
                        
                            
                            
                                var cookiename=getCookie("screentopdiv");if (cookiename == "0") { document.write('Dear Customers, your order may will be delayed 1-3 days due to th...
                            
                            
                                分类:
Web程序   时间:
2014-10-16 14:00:22   
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211
                             
                         
                    
                        
                            
                            
                                1. 三表联合查询select XX,XX from a , b , c笛卡尔积,等同于cross join4. cross join--列出两边所有组合,也叫笛卡尔集A.Rows * B.Rowsselect *from Sales S cross join Customers C5. inner...
                            
                            
                                分类:
数据库   时间:
2014-10-13 19:14:56   
                                阅读次数:
209
                             
                         
                    
                        
                            
                            
                                zencart重置用户ID为99的登录密码为aaaaaaaupdate customers set customers_password='1ebf0e689c7d44a19e4d0070ab381f81:52' where customers_id=99;
                            
                            
                                分类:
数据库   时间:
2014-10-12 17:52:28   
                                阅读次数:
249