ปีเดียวที่ทีมตกชั้นคือปีไหน ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
what was the only year the team was relegated ?It is not neccessary to use all the tables.
 table_204_589:  id [ number]  "season" [ text]  "tier" [ number]  "division" [ text]  "pos." [ text]  "notes" [ text] 
SELECT "season" FROM table_204_589 WHERE "notes" = 'relegated'