我如何在qlikview中執行增量加載

Question

我有一個交易表，並且每天添加新記錄。我想構建一個只加載增量數據的QVD文件。

Answer 1

您需要日期（時間）列來標識新記錄。

然後，你可以這樣來做：

///$tab Main 
SET ThousandSep='.'; 
SET DecimalSep=','; 
SET MoneyThousandSep='.'; 
SET MoneyDecimalSep=','; 
SET MoneyFormat='#.##0,00 €;-#.##0,00 €'; 
SET TimeFormat='hh:mm:ss'; 
SET DateFormat='DD.MM.YYYY'; 
SET TimestampFormat='DD.MM.YYYY hh:mm:ss[.fff]'; 
SET MonthNames='Jan;Feb;Mrz;Apr;Mai;Jun;Jul;Aug;Sep;Okt;Nov;Dez'; 
SET DayNames='Mo;Di;Mi;Do;Fr;Sa;So'; 

set vSourceDir = 'C:\devel\qlikview\2013\Incremental_Load\'; 

///$tab Initial 
// Initial data load 

/* 

Sales: 
LOAD OrderId, 
    ProductId, 
    CustomerId, 
    Amount, 
    date(Date_updated) as Date_updated 
FROM 
$(vSourceDir)Data.xlsx 
(ooxml, embedded labels, table is Orders); 

STORE Sales INTO $(vSourceDir)sales.qvd (qvd); 

*/ 
///$tab Load from QVD 
// load sales.qvd 

Sales: 
LOAD OrderId, 
    ProductId, 
    CustomerId, 
    Amount, 
    date(Date_updated) as Date_updated 
FROM 
$(vSourceDir)sales.qvd 
(qvd); 

Sort_Sales: 
LOAD * 
Resident Sales 
Order By Date_updated; 

LET vLastUpdateDate = date(Peek('Date_updated', -1, 'Sort_Sales')); 


DROP TABLE Sales; 

///$tab Perform Incremental load 
// load only new (incremental) data 

Incremental: 
NoConcatenate 
LOAD OrderId, 
    ProductId, 
    CustomerId, 
    Amount, 
    date(Date_updated) as Date_updated 
FROM 
$(vSourceDir)Data.xlsx 
(ooxml, embedded labels, table is NewOrders) 
where date(Date_updated) >= '$(vLastUpdateDate)'; 



///$tab Update QVD 
// load data from qvd without the records that where changed 

Concatenate 
LOAD OrderId, 
    ProductId, 
    CustomerId, 
    Amount, 
    date(Date_updated) as Date_updated 
FROM 
$(vSourceDir)sales.qvd (qvd) 
where not exists(OrderId); 

STORE Incremental INTO $(vSourceDir)sales.qvd; 

這裏的解釋是https://www.youtube.com/watch?v=UkKTmnKSNQo

HTH