UDF &VIEWSIN SQL

Muhammed Tanveer Melayishernoobi@gmail.comMuhammed Thanveer Danish MelayiMuhammed Thanveer. MLinkedin Profile

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Disclaimer: This presentation is prepared by trainees of baabtra.com as a part of mentoring program. This is not official document of baabtra.com – Mentoring Partner

UDFThere are three Types of UDFS in Sql Server:1. Scalar

2. Inline Table-Valued

3. Multi-statement Table-Valued

• It can be used with SQL select queries same like we use any other scalar or aggregate functions that we discussed earlier(eg :sum(),Avg()ect)

• UDF must return value

Scalar User-Defined FunctionA Scalar UDF can accept 0 to many input parameter and will return a single value. A Scalar user-defined function returns one of the scalar (int, char, varchar etc) data types. Text, ntext, image and timestamp data types are not supported.

exampleCREATE FUNCTION AddTwoNumbers(@a int,@b int)RETURNS intASBEGINRETURN @a + @bENDSELECT dbo.AddTwoNumbers(30,20)

Table-valued functionsA table-valued UDF is a function that accepts parameters and returns the results in the form of a table. This type of function is special because it returns a table that you can query the results of and join with other tables

example CREATE FUNCTION GetAllProducts( )RETURNS TABLEASRETURN(SELECT ProductID, ProductName, RetailPrice, CategoryFROM CurrentProducts)GO

VIEWS • A view is a customized representation of data from one

or more tables.The table that the view is referencing are known as base table

• A view can be considered as a stored query or virtual table

• View Doesn’t take any storage space

syntaxCREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition

example CREATE VIEW [Current Product List] ASSELECT ProductID,ProductNameFROM ProductsWHERE Discontinued=No

Views - Advantages• Data Security No need to give permission on the table.infact a view can be created,having only selected • Simplicity A very complicated query can be saved as a view definition.When needed can be called by its view name • Removes Dependency Can be very helpful to remove the dependency from the underlying tables.suppose a view is created join servel tables

thank you

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