then for you...

2. UDF &VIEWS
IN SQL
Muhammed Tanveer Melayi
shernoobi@gmail.com
Muhammed Thanveer Danish Melayi
Muhammed Thanveer. M
Linkedin Profile
TYPING SPEED:25

3. 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

4. UDF
There 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

5. Scalar User-Defined Function
A 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.
example
CREATE FUNCTION AddTwoNumbers
(
@a int,
@b int
)
RETURNS int
AS
BEGIN
RETURN @a + @b
END
SELECT dbo.AddTwoNumbers(30,20)

6. Table-valued functions
A 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

7. example
CREATE FUNCTION GetAllProducts( )
RETURNS TABLE
AS
RETURN
(SELECT ProductID, ProductName, RetailPrice, Category
FROM CurrentProducts)
GO

8. 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

9. syntax
CREATE VIEW view_name
AS
SELECT column_name(s)
FROM table_name
WHERE condition
example
CREATE VIEW [Current
Product List] AS
SELECT
ProductID,ProductNam
e
FROM Products
WHERE
Discontinued=No

10. 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

11. thank you

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