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Although the type 2 change preserves the historic context of facts, it does not preserve history in the dimension. It is easy to see that a given natural key has taken on multiple representations in the dimension, but we do not know when each of these representations was correct. This information is only provided by way of a fact. For example, after the change to Sue s address has occurred, the dimension table in Figure 3-8 shows that there have been two versions of Sue, but it cannot tell us what Sue looked like on any given date. Where was she living on January 1, 2008 The dimension table does not carry this information. If there is an order for January 1, 2008, we are in luck, because the orders fact table will refer to the version of Sue that was correct at the time of the order. If there is not an order on that date, we are unable to determine what Sue looked like at that point in time. It may be clear to you that this problem is easily rectified by adding a date stamp to each version of Sue. This technique allows the dimension to preserve both the history of facts and the history of dimensions. Another possibility is to build an additional fact table that associates versions of Sue with various dates. These techniques will be explored in 8. .net pdf 417 PDF - 417 C# Control - PDF - 417 barcode generator with free C# ...
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2 May 2019 ... NET framework. It is the second article published by this author on encoding and decoding of PDF417 barcodes. The first article is PDF417 ... Once you ve captured the information you need, it s time to apply it. If you re really a hard-core DBA, you might start examining query statistics and optimizing indexes manually. However, if you re like me (averse to long, complicated, boring tasks), you ll probably want the SQL Server Index Tuning Wizard to generate your reports automatically. The wizard can be launched from within SQL Server Enterprise Manager and can use the workload that you ve generated with Profiler for analysis. The recommendations will look similar to the ones shown in Figure 4-17. You can choose to have the wizard automatically execute the recommendations, or save them as a SQL script for later analysis. .net pdf 417 ASP. NET PDF-417 Barcode Generator - Generate 2D PDF417 in ...
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NET PDF-417 Generator SDK Tutorial tells users how to generate 2D PDF-417 Barcodes in .NET Framework with C# class. In some cases the query results can be a single value, as in the following example: What are the average sales of our salespeople SELECT AVG(SALES) FROM SALESREPS AVG(SALES) -----------$289,353.20 These query results are still a table, although it's a very small one consisting of one column and one row. Finally, it's possible for a query to produce zero rows of query results, as in this example: List the name and hire date of anyone with sales over $500,000. SELECT NAME, HIRE_DATE FROM SALESREPS WHERE SALES > 500000.00 NAME ----------HIRE_DATE --------- An important part of star schema design is identification of slow change processing rules for dimensions. For a given source change, the correct response is dictated by analytic requirements. A single dimension may exhibit type 1 responses to some changes and type 2 responses to other changes. The ETL developer will be responsible for applying these rules during the loading process. 4: .net pdf 417 Best 20 NuGet pdf417 Packages - NuGet Must Haves Package
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PDF417 is a stacked linear barcode format used in a variety of applications such as transport, identification cards, and inventory management. "PDF" stands for ... Even in this situation, the query results are still a table. This one is an empty table with two columns and zero rows. Note that SQL's support for missing data extends to query results as well. If a data item in the database has a NULL value, the NULL value appears in the query results when the data item is retrieved. For example, the SALESREPS table contains NULL values in its QUOTA and MANAGER columns. The following query returns these NULL values in the second and third columns of query results: List the salespeople, their quotas, and their managers. SELECT NAME, QUOTA, MANAGER FROM SALESREPS NAME -------------Bill Adams Mary Jones Sue Smith Sam Clark Bob Smith Dan Roberts Tom Snyder Larry Fitch QUOTA -----------$350,000.00 $300,000.00 $350,000.00 $275,000.00 $200,000.00 $300,000.00 NULL $350,000.00 MANAGER ---------104 106 108 NULL 106 104 101 106 Although slow changes are triggered by the source data, we tend to talk about them with respect to the dimension table. In the case of Sue Johnson, for example, we refer to the dimension table s date_of_birth column as a type 1 attribute, and the state column as a type 2 attribute. These designations are shorthand for the following two statements: For any given customer_id in the dimension table, if the source of the date_of_birth value changes, overwrite existing dimension rows with the new value. For any given customer_id in the dimension table, if the source of the state value changes, insert a new row into the dimension table. As you can see, it is much easier to say that date_of_birth is a type 1 attribute, and state is a type 2 attribute. Figure 3-9 shows what this might look like in a diagram. The differences between type 1 and type 2 slow change responses are summarized in Figure 3-10. Most of the time, a type 2 response is the most appropriate. It does not restate previously existing facts, nor does it destroy the dimension table s ability to maintain history. Unfortunately, novice design teams often choose the opposite route, handling all changes as type 1. This invariably leads to problems that cannot be corrected without reloading the original source data. Type 1 changes can also introduce additional complexity, as discussed in the sidebar Type 1 Complications. There are situations in which the change of a source element may result in either type of response. Many operational systems log the change history for significant entities. Sometimes, these systems record the reason for a change, which in turn may dictate how the star schema Figure 4-17. .net pdf 417 2D barcode PDF417 library download | SourceForge. net
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