Table: melbourne_cup_results
Columns: saddle_cloth
horse
trainer
jockey
weight_kg
barrier_b
placing

Question: For which jockey was the weight in kg 53.5? 
SQL: SELECT "jockey" FROM melbourne_cup_results WHERE "weight_kg" = '53.5'

Question: Who was the trainer when the jockey was Luke Nolen?
SQL: SELECT "trainer" FROM melbourne_cup_results WHERE "jockey" = 'Luke Nolen'

Question: What was the placing when the jockey was Damien Oliver?
SQL: SELECT "placing" FROM melbourne_cup_results WHERE "jockey" = 'Damien Oliver'

Question: What was the placing when the weight in kg was 58.0?
SQL: SELECT "placing" FROM melbourne_cup_results WHERE "weight_kg" = '58.0'

Question: Who was the horse when the jockey was Peter Wells? 
SQL: SELECT "horse" FROM melbourne_cup_results WHERE "jockey" = 'Peter Wells'

Question: What was the weight in kg when the horse was Alcopop? 
SQL: SELECT "weight_kg" FROM melbourne_cup_results WHERE "horse" = 'Alcopop'