Table: iron_fist_album_sales
Columns: date
region
label
catalogue
format

Question: What is Label, when Date is 1987?
SQL: SELECT "label" FROM iron_fist_album_sales WHERE "date" = '1987'

Question: What is Date, when Format is Vinyl, and when Label is Mercury?
SQL: SELECT "date" FROM iron_fist_album_sales WHERE "format" = 'vinyl' AND "label" = 'mercury'

Question: What is Date, when Region is Yugoslavia?
SQL: SELECT "date" FROM iron_fist_album_sales WHERE "region" = 'yugoslavia'

Question: What is Format, when Label is Bronze, when Date is 1982, and when Catalogue is 204 636?
SQL: SELECT "format" FROM iron_fist_album_sales WHERE "label" = 'bronze' AND "date" = '1982' AND "catalogue" = '204 636'

Question: What is Date, when Label is Jugoton?
SQL: SELECT "date" FROM iron_fist_album_sales WHERE "label" = 'jugoton'