Table: giro_1993
Columns: stage
winner
general_classification
points_classification
mountains_classification
young_rider_classification
intergiro_classification
trofeo_fast_team

Question: Who's the leader in the young rider classification in stage 12?
SQL: SELECT "young_rider_classification" FROM giro_1993 WHERE "stage" = '12'

Question: Who's leading in the general classification in stage 1a?
SQL: SELECT "general_classification" FROM giro_1993 WHERE "stage" = '1a'

Question: How many leaders are there in the intergiro classification in stage 20?
SQL: SELECT COUNT("intergiro_classification") FROM giro_1993 WHERE "stage" = '20'

Question: What's the leader team in the Trofeo Fast Team in stage 20?
SQL: SELECT "trofeo_fast_team" FROM giro_1993 WHERE "stage" = '20'

Question: Who's the winner in stage 1a, where the leader in the young rider classification is Francesco Casagrande?
SQL: SELECT "winner" FROM giro_1993 WHERE "young_rider_classification" = 'Francesco Casagrande' AND "stage" = '1a'

Question: Who's the leader in the general classification in stage 1a?
SQL: SELECT "general_classification" FROM giro_1993 WHERE "stage" = '1a'