datamatrix c# library ROW_NUMBER in Visual C#

Generation DataMatrix in Visual C# ROW_NUMBER

ROW_NUMBER
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Our first ranking function, ROW_NUMBER, allows your code to guarantee an ascending sequence of numbers to give each row a unique number. Until now, it has not been possible to guarantee sequencing of numbers, although an IDENTITY-based column could potentially give a sequence providing all INSERTs succeeded and no DELETEs took place.
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This function is ideal for giving your output a reference point, for example, Please take a look at row 10 and you ll see... . Another use for this function is to break the data into exact chunks for scrolling purposes in GUI systems. For example, if five rows of data are returned, row 1 could be displayed, and then Next would allow the application to move to row 2 easily rather than using some other method. The following is an example that shows how the ROW_NUMBER() function can provide an ascending number for each row returned when inspecting the Employee view. This is a view in AdventureWorks that shows details of employees who work within the AdventureWorks company. The ROW_NUMBER() function is nondeterministic, and since the ORDER BY within the OVER function doesn t produce a unique sequence of data (because there might be several people with the same last name, for example), then you would need to find some other way to achieve uniqueness, if getting the same order with each execution were mandatory. USE AdventureWorks GO SELECT ROW_NUMBER() OVER(ORDER BY LastName) AS RowNum, FirstName + ' ' + LastName FROM HumanResources.vEmployee WHERE JobTitle = 'Production Technician - WC60' ORDER BY LastName When we execute the code, we see the names in last name order, as shown in Figure 12-6.
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Figure 12-6. Rows with row numbering It s also possible to reset the sequence to give a unique ascending number within a section, or partition of data, using the PARTITION BY option. This would be ideal if, for example, in the same marathon you had different races, such as male, female, disabled male, disabled female, over 60s, and so on. Using the category the runner is in as the basis of the partition, no matter in what order the runners cross the line, we would still have the right numbering for each category. The following example will reset the sequential number at each change of first letter in the last name of the employees.
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USE AdventureWorks GO SELECT ROW_NUMBER() OVER(PARTITION BY SUBSTRING(LastName,1,1) ORDER BY LastName) AS RowNum, FirstName + ' ' + LastName FROM HumanResources.vEmployee WHERE JobTitle = 'Production Technician - WC60' ORDER BY LastName When we execute the code, as the first letter of the last name alters, we see the RowNum column, which contains the value for ROW_NUMBER() alter, as shown in Figure 12-7.
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Figure 12-7. Rows with row numbering resetting on change of last name, first letter
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RANK
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If a row of data is returned that contains the same values as another row as defined in the ORDER BY clause of your statement, the keyword RANK will give these rows the same numerical value. An internal count is kept so that on a change of value you will see a jump in the value. For example, say you watch a sport like golf, and in a golf tournament you re following Tiger Woods who wins the tournament on a score of 4 under par, but Colin Montgomery, Arnold Palmer, and Lee Westwood are joint second on 3 under par. Finally, Michelle Wie finishes her round on 2 under par. Tiger would have the value 1; Colin, Arnold, and Lee would have the value 2; and Michelle would have the value 5. This is exactly what RANK does. This function would also be useful in applications that wanted to return different rankings of data but only show the data from one rank at any one time on each page. The example to demonstrate RANK uses the vEmployeeDepartment view, in which there are more rows with the same value than in vEmployee. Here the ROW_NUMBER() function is used as it was in the previous example, enabling a cross-check where the RANK function skips to the right number. When you run the query, you ll find that there are five rows with a Department called Document Control. RANK will assign these rows the number 1. When the Department changes to Engineering, RANK will change to the value 6.
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