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Old 12-12-2016, 11:47 PM   #1
chinmay.sahoo
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Arrow What is an In Line Table User Defined Function in SQL Server?

• Returns a row set of the SQL Server table data type.

• Takes the structure of the row set from the SELECT statement itself.

• It is an exceptional alternative to a view

• Can pass parameters and in essence provide us with a parameterized, non-updateable view



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Old 03-16-2017, 12:28 AM   #2
sonvi.belani
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Hi,

User Defined Functions play an important role in SQL Server. User Defined functions can be used to perform a complex logic, can accept parameters and return data. Many a times we have to write complex logic which cannot be written using a single query. In such scenarios, UDFs play an important role. For example, we can call user defined function in a where clause or use a user defined function in a JOIN [Where UDF returns a result set].

SQL Server supports two types of User Defined Functions as mentioned below –

- Scalar Functions – The function which returns a Scalar/Single value.

- Table Valued Functions – The function which returns a row set of SQL server Table datatype. Table Valued Functions can be written as –
Inline Table

Multi-statement Table
We will explore these functions today. I am using SQL Server 2012 for this demonstration, although you can use SQL Server 2005, 2008, 2008 R2 as well.

I have preconfigured Northwind database on my SQL Server instance. We will be using the following tables for creating different User Defined Functions –
1) Customers
2) Employees
3) Orders
4) Order Details
5) Products

Thanks
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