รางวัลต่ำสุดสำหรับ Irish Derby Race คือเท่าใด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
What is the lowest Prize amount for the Irish Derby Race?It is not neccessary to use all the tables.
 table_name_87:  (prize__ [ INTEGER ] race [ VARCHAR) ]
SELECT MIN(prize__) AS £k_ FROM table_name_87 WHERE race = "irish derby"