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In other words, you can only use the SELECT command when you re dealing with external tables, not the INSERT, UPDATE, or DELETE command In reality, an external table is an interface to an external datafile However, you may query this external table like a virtual table, just as you would query any regular Oracle table, which makes it a very powerful tool for data warehouse ETL activities You can query external tables or join them with regular tables, without ever loading the external data into your database In addition, you may create other regular tables or views from the external tables, so this feature comes in handy during the population of data warehouses SQL*Loader and the external tables feature perform similarly in terms of data-loading speed, in most cases The two techniques offer you alternative methods of loading data into your database. asp.net barcode reader control Asp . net barcode and qr code scanner | The ASP . NET Forums
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Reading barcodes with ASP . NET web applications with Bytescout BarCode Reader SDK for .NET. tables from external sources The following are the general advantages that the external table method of loading offers in comparison with the SQL*Loader method: You can query data in the external files before it s loaded into the tables You can perform an extensive range of transformations on the data during the load process itself SQL*Loader is limited in the number of data transformations you can perform You may choose to perform data transformation at the same time you re loading data into the tables This is called the pipelining of the two phases When you use SQL*Loader to load directly into the tables, you can t perform anything other than the most minimal data transformation at load time Consequently, major transformations must be done in a separate step from that of data loading. how to use barcode scanner in asp.net c# how we add barcode scanner in asp.net - C# Corner
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May 12, 2018 · C#, Windows Application, BarCode, Scanner, TextBox, Mobile Windows Application, Zebra Scanner ,How to add the value of Barcode scanner ... External tables are suitable for large data loads that may have a onetime use in your database External tables save the time involved in creating real database tables and then aggregating the data dimensions for loading into other tables External tables eliminate the need to create staging or temporary tables, which are almost a must if you re using SQL*Loader to load the data from external sources You don t need any physical space even for the largest external table Once the datafiles are loaded into the operating system, you can create your external tables and start executing SQL queries against them If you need to load data remotely, or if your data doesn t need major transformations, SQL*Loader is the best way to go External tables are in no way as versatile as regular database tables, because they re read-only tables. In the previous section, the child Decorator classes had no reference back to the parent. There are cases in which children need access to the parent, and the common way to achieve this is by equipping each child with a reference to the parent, as shown in Figure 1-60. asp.net mvc barcode reader how we add barcode scanner in asp . net - C# Corner
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May 9, 2016 · The tutorial demonstrates how to build mobile barcode reader using HTML5, ASP.NET, and Dynamsoft Barcode Reader. Follow the steps and ... Furthermore, external tables suffer from the limitation that you can t index them Therefore, high-powered query work with these tables is impractical If the data in your staging tables needs to be indexed for some reason, then SQL*Loader is the only viable alternative The real benefit of the external tables feature is primarily realized in data warehousing environments or in situations where you need to load and transform huge amounts of data when you first load an application.. If you want to create indexes on a staging table, you re better off using the SQL*Loader utility to load data into the table. You can t index an external table! Figure 1-60. A parent-child relationship with children having references to the parent A potentially problematic consequence of adding a reference from the children to the parent appears if you look at the design s coupling diagram, shown in Figure 1-61. asp.net reading barcode Barcode in ASP.NET/C# - YouTube
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