ปีแรกสุดที่ World Junior Championships มีโน้ต 1,500 ม. คือปีใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What is the earliest year the world junior championships has 1500 m notes?It is not neccessary to use all the tables.
 table_name_85:  (year [ INTEGER ] notes [ VARCHAR ] competition [ VARCHAR) ]
SELECT MIN(year) FROM table_name_85 WHERE notes = "1500 m" AND competition = "world junior championships"