declaring variables in mysql code example

Example 1: what does declare do in mysql

-- MySQL

DECLARE variable_name datatype(size) [DEFAULT default_value];
-- Declaring a variable without specifying a default value will result it
-- in being a null value.
-- Declare is what allows us to create a variable

Example 2: mysql declare variable

SET start = 1;
SET finish = 10;

SELECT * FROM places WHERE place BETWEEN start AND finish;