โรงเรียนใดมีจำนวนนักเรียนเข้าเรียนน้อยที่สุด ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
which school has the least number of students attending it ?It is not neccessary to use all the tables.
 table_204_501:  id [ number]  "institution" [ text]  "location" [ text]  "nickname" [ text]  "founded" [ number]  "type" [ text]  "enrollment" [ number]  "joined" [ number] 
SELECT "institution" FROM table_204_501 ORDER BY "enrollment" LIMIT 1