This document discusses stored functions in SQL. It defines a function as a named block that returns a value and can be stored in a database for repeated execution. It provides examples of declaring a function using CREATE FUNCTION that returns a student's name based on their enrollment ID. The function is called within a SELECT statement to return the name. Contact details are also included for Baabtra Mentoring Partner.

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3. STORED FUNCTIONS
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4. 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

5. • function can return one value which is
mandatory.
• functions can have only input parameters.
• function can be embedded in a select
statement.

6. DECLARATION
• Functions are declared using the following
syntax:
function <function-name> (param_spec1, …,
param_speck)
returns <return_type>
begin
-- execution code
end;

7. +--------+--------+---------+-----------+----------+
| 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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