Table: mint_coins_2000s_2
Columns: year
butterfly
artist
mintage
issue_price
finish

Question: Which artist's work is the butterfly Tiger Swallowtail?
SQL: SELECT "artist" FROM mint_coins_2000s_2 WHERE "butterfly" = 'tiger swallowtail'

Question: Which artist uses a finish of selective gold plating?
SQL: SELECT "artist" FROM mint_coins_2000s_2 WHERE "finish" = 'selective gold plating'

Question: What mintage earlier than the year 2006 has the butterfly great spangled fritillary.
SQL: SELECT "mintage" FROM mint_coins_2000s_2 WHERE "year" < 2006 AND "butterfly" = 'great spangled fritillary'