1440. Evaluate Boolean Expression.sql

SELECT e.*,
 CASE WHEN operator ='=' THEN v1.value=v2.value
 WHEN operator ='>' THEN v1.value>v2.value
 WHEN operator ='<' THEN v1.value<v2.value
 END AS value
FROM expressions_1440 e
INNER JOIN variables_1440 v1 ONe.left_operand=v1.name
INNER JOIN variables_1440 v2 ONe.right_operand=v2.name;