user defined functions in sql example

Example 1: user defined function sql

Collation is defined as a set of rules
that determine how data can be sorted 
as well as compared. Character data is
sorted using the rules that define the 
correct character sequence along with
options for specifying case-sensitivity,
character width etc.

Example 2: user defined variables in sql

SET @var_name = expr [, @var_name = expr] ...