SELECT ProductId, dbo.ufnGetProductListPrice(ProductId, ModifiedDate) FROM Sales.SalesOrderDetail in VS .NET

Painting PDF417 in VS .NET SELECT ProductId, dbo.ufnGetProductListPrice(ProductId, ModifiedDate) FROM Sales.SalesOrderDetail

SELECT ProductId, dbo.ufnGetProductListPrice(ProductId, ModifiedDate) FROM Sales.SalesOrderDetail
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The function has two parameters product ID and order date and returns the price for the given product as of the order date. Because the function is in the dbo schema, to call the function, you must prefix it with dbo. This prefix tells SQL Server that you re using a UDF rather than a system function.
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Working with Transact-SQL
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What is the main difference between querying a UDF and a built-in function When querying a UDF, you must specify the function s schema. Built-in functions do not participate in schemas.
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You can use .NET CLR user-defined types (UDTs) to programmatically extend SQL Server s type system. Querying CLR UDTs is not quite the same as querying built-in types. If you need the results returned as a string, you must use the ToString method that all CLR UDTs define. Assume that the PhoneNumber column of the ContactInformation table uses a UDT. The following query would return the phone numbers as strings if your database used a UDT for the PhoneNumber column:
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SELECT PhoneNumber.ToString() FROM ContactInformation
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In addition to exposing the ToString method for returning strings, CLR UDTs can have additional methods and properties defined that can help to retrieve data in various ways. For instance, the PhoneNumber type might have a property called AreaCode that returns only the area code for the phone number. In that case, you could use the following query to get all the area codes from the ContactInformation table, again only if your database used a UDT for the PhoneNumber column:
SELECT PhoneNumber.AreaCode FROM ContactInformation
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How do you return the value of a CLR UDT as a string All CLR UDTs expose a method called ToString, which you can call to retrieve a string representation of the type.
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Lesson 2: Formatting Result Sets
Creating Column Aliases
When writing queries, you often need to change the name of output columns to make them more user-friendly. You do this by using the AS modifier. For instance, in the following query, the SalariedFlag column will appear to the user as a column called IsSalaried :
SELECT EmployeeId, SalariedFlag AS IsSalaried FROM HumanResources.Employee
You can also use the AS modifier to define a column name whenever one doesn t exist. For example, if you use an expression or a scalar function to define the column, the column name by default will be NULL.
BEST PRACTICES
Use distinct column names
It s a good idea to make sure that every output column of a query has a distinct column name. Applications should always be able to rely on column names for programmatically retrieving data from a query and should not be forced to use column ordinal position.
PRACTICE
Formatting Column Output
In this exercise, you will practice using some of the system functions available for formatting column output. Assume that you have the following business requirement: Write a query that returns for every employee in the Employee table that employee s hire date formatted using the ANSI date format, number of vacation hours, and the employee s login ID, without the standard prefix. All data must be concatenated for each employee into a single comma-delimited string, and the column should be called EmpData . 1. If necessary, open SSMS and connect to your SQL Server. 2. Open a new query window and select AdventureWorks as the active database. 3. Type the following query and execute it:
SELECT HireDate, VacationHours, LoginId FROM HumanResources.Employee
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Working with Transact-SQL
4. Note the formatting problems: HireDate is not formatted according to the ANSI date format, and LoginId needs to have the adventure-works\ prefix removed. 5. First, format HireDate according to the ANSI date format by using the CONVERT function. Type the following query and execute it:
SELECT CONVERT(CHAR(10), HireDate, 2), VacationHours, LoginId FROM HumanResources.Employee
6. Next, remove the prefix from the login ID. You can do this easily by using the REPLACE, SUBSTRING, or STUFF function. The following code example shows how to remove the prefix by using REPLACE to replace the prefix with an empty string:
SELECT CONVERT(CHAR(10), HireDate, 2), VacationHours, REPLACE(LoginId, 'adventure-works\', '') FROM HumanResources.Employee
7. Before concatenating the information, you need to convert VacationHours into a string:
SELECT CONVERT(CHAR(10), HireDate, 2), STR(VacationHours), REPLACE(LoginId, 'adventure-works\', '') FROM HumanResources.Employee
8. Now you can concatenate the data by using the concatenation operator (+):
SELECT CONVERT(CHAR(10), HireDate, 2) + ', ' + STR(VacationHours) + ', ' + REPLACE(LoginId, 'adventure-works\', '') FROM HumanResources.Employee
9. Finally, you apply the column alias:
SELECT CONVERT(CHAR(10), HireDate, 2) + ', ' + STR(VacationHours) + ', ' + REPLACE(LoginId, 'adventure-works\', '') AS EmpData FROM HumanResources.Employee
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