mysql set variable in select code example

Example 1: how to create a variable in mysql

-- MySQL

SET @variable_name := value;

Example 2: define a variable in mysql from select

SELECT salary INTO @variable1 FROM employee_info WHERE emp_id = 12345678 LIMIT 1;
SELECT salary, salary_group INTO @var1, @var2 FROM employee_info WHERE emp_id = 12345678;