ใครคือผู้ชนะในสเตจ 1a โดยผู้นำประเภทนักแข่งรุ่นเยาว์คือ Francesco Casagrande?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Who's the winner in stage 1a where the leader in the young rider classification is Francesco Casagrande?It is not neccessary to use all the tables.
 table_12261714_2:  (winner [ VARCHAR ] young_rider_classification [ VARCHAR ] stage [ VARCHAR) ]
SELECT winner FROM table_12261714_2 WHERE young_rider_classification = "Francesco Casagrande" AND stage = "1a"