Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

STORED FUNCTIONS

Waseem hassanwazeeem456@gmail.comwww.facebook.com/us/twitter.com/usernamein.linkedin.com/in/profilename9567850028

A function:• Is a named SQL block that returns a value• Can be stored in the database as a schema object for

repeated execution• Is called as part of an expression or is used to provide

a parameter value

• function can return one value which is mandatory.

• functions can have only input parameters.• function can be embedded in a select

statement.

DECLARATION

• Functions are declared using the following syntax:

function <function-name> (param_spec1, …, param_speck)

returns <return_type> begin

-- execution codeend;

+--------+--------+---------+-----------+----------+| enrlno | rollno | name | city | mobile |+--------+--------+---------+-----------+----------+| 20 | 1 | paul | cochin | 96754555 || 11 | 2 | akhil | delhi | 98756579 || 6 | 4 | maya | bangalore | 98734534 || 3 | 5 | sandeep | delhi | 84865644 || 1 | 8 | anoop | bangalore | 93456535 |+--------+--------+---------+-----------+----------+

delimiter //CREATE FUNCTION get_name(id int) RETURNS varchar(20)BEGIN declare nam varchar(20); SELECT name INTO nam FROM student WHERE enrlno = id; RETURN nam;END//

select get_name(11)//+--------------+| get_name(11) |+--------------+| akhil |+--------------+

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