Table: olympic_stamps
Columns: date_of_issue
theme
denomination
printer
quantity
design
perforation
first_day_cover_cancellation

Question: Which design uses the theme alpine skiing?
SQL: SELECT "design" FROM olympic_stamps WHERE "theme" = 'alpine skiing'

Question: When did the Theme of bobsleigh release?
SQL: SELECT "date_of_issue" FROM olympic_stamps WHERE "theme" = 'bobsleigh'