มีกี่ขั้นตอนที่ Alberto Contador ผู้ชนะและการจัดประเภทคะแนน?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many stages were there where the winner and the points classification were Alberto Contador?It is not neccessary to use all the tables.
 table_15294880_2:  (stage [ VARCHAR ] winner [ VARCHAR ] points_classification [ VARCHAR) ]
SELECT COUNT(stage) FROM table_15294880_2 WHERE winner = "Alberto Contador" AND points_classification = "Alberto Contador"