Table: tour_de_france_1986_2
Columns: stage
winner
general_classification
points_classification
young_rider_classification
team_classification

Question: What Young rider classification has a Stage of 18?
SQL: SELECT "young_rider_classification" FROM tour_de_france_1986_2 WHERE "stage" = '18'

Question: Who has a Team classification of la vie claire, a stage of 20, a General classification of greg lemond?
SQL: SELECT "winner" FROM tour_de_france_1986_2 WHERE "team_classification" = 'la vie claire' AND "general_classification" = 'greg lemond' AND "stage" = '20'

Question: What is the classification with a Team classification of la vie claire and a Stage of 12?
SQL: SELECT "general_classification" FROM tour_de_france_1986_2 WHERE "team_classification" = 'la vie claire' AND "stage" = '12'

Question: What is guido bontempi's general classification when he has a stage of 6?
SQL: SELECT "general_classification" FROM tour_de_france_1986_2 WHERE "winner" = 'guido bontempi' AND "stage" = '6'

Question: What is Ludo Peeters' team classification?
SQL: SELECT "team_classification" FROM tour_de_france_1986_2 WHERE "winner" = 'ludo peeters'