select and set value mysql code example

Example 1: mysql change value

UPDATE [LOW_PRIORITY] [IGNORE] table_name 
SET 
    column_name1 = expr1,
    column_name2 = expr2,
    ...
[WHERE
    condition];

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;

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