Table: col_des_ares
Columns: year
stage
start
finish
leader_at_the_summit

Question: Who was the leader at the summit earlier than 1956, when Carcassonne shows for finish?
SQL: SELECT "leader_at_the_summit" FROM col_des_ares WHERE "year" < 1956 AND "finish" = 'carcassonne'

Question: What year was finish Toulouse, and stage was larger than 12?
SQL: SELECT SUM("year") FROM col_des_ares WHERE "finish" = 'toulouse' AND "stage" > 12

Question: What is the highest stage number for a year later than 1948, leader at the summit was group, and finish was Bagnères-De-Bigorre?
SQL: SELECT MAX("stage") FROM col_des_ares WHERE "year" > 1948 AND "leader_at_the_summit" = 'group' AND "finish" = 'bagnères-de-bigorre'