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Creating PDF 417 in Font WORKING WITH NEW DATA TYPES

CHAPTER 9 WORKING WITH NEW DATA TYPES
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+00:00, the UTC time, the date and time values adjust. By using the TODATETIMEOFFSET function, you can add a time zone to a regular date and time.
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Figure 9-10. The results of using DATETIMEOFFSET The new data type and functions may be useful to you if you work with data in different time zones. When time changes go into effect, such as daylight saving time, the offsets do not adjust. Keep that in mind if you choose to work with DATETIMEOFFSET.
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HIERARCHYID
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SQL Server 2008 ships with the HIERARCHYID data type used to represent hierarchical relationships in data, for example, family trees, organizational charts, or directory structures. This new data type is a CLR data type, which means that it can contain multiple properties, instead of just one value. The HIERARCHYID column also has methods, which means that columns and variables of this type can do something and not just contain a value. The HIERARCHYID data type ships with SQL Server 2008, and you can use it even if you do not want to create any custom types. You learned about joining a table to itself in the Self-Joins section in 4. In older versions of AdventureWorks, the ManagerID column points back to the EmployeeID column in the HumanResources.Employee table. To follow the org chart from this table, you must recursively follow the chain of command from the CEO down each manager-employee path to the lowest employee, which is pretty difficult to do with T-SQL. 10 covers how to do this in the Writing Recursive Queries section. The AdventureWorks2008 database replaces the self-join with OrganizationalNode, a HIERARCHYID column, which is much easier to query.
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Viewing HIERARCHYID
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If you just write a query to view the OrganizationalNode in the HumanResources.Employee table, you will see binary data. That is because CLR data types are stored as binary values. To view the data in readable form, you must use the ToString method of the type. The OrganizationalLevel column in the table is a computed column based on OrganizationalNode using the GetLevel method. Type in and execute Listing 9-8 to view the data.
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CHAPTER 9 WORKING WITH NEW DATA TYPES
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Listing 9-8. Viewing the OrganizationalNode USE AdventureWorks2008; GO SELECT BusinessEntityID, SPACE((OrganizationLevel) * 3) + JobTitle AS Title, OrganizationNode, OrganizationLevel, OrganizationNode.ToString() AS Readable FROM HumanResources.Employee ORDER BY Readable; Figure 9-11 shows the partial results. As mentioned, the OrganizationalNode data is meaningless unless you use the ToString method as in the Readable column. By using the SPACE function to indent the JobTitle column from the table to produce the Title column in the results and by sorting on the Readable column, you can see the relationships between the job titles in the data.
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Figure 9-11. The partial results of querying the HumanResources.Employee table The very first node in the hierarchy is the CEO, or chief executive officer, of the company, represented as a slash (/) in the Readable column. The level for the CEO is 0, which you can see in the computed column OrganizationLevel. Several employees have an OrganizationLevel of 1; these employees report directly to the CEO. If you scroll down through all the results, you will see that these have a value, 1 through 6, in between two slashes. The vice president of engineering is the first node in level 1. The marketing manager is the second node in level 1. Each of these employees has other employees reporting to them. Those employees have a level of 2. For example, the engineering manager reports to the vice president of engineering and has a Readable value of /1/1/. Four employees report to the engineering manager. These employees all have Readable values that begin with /1/1/ along with an additional value, 1 through 4.
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