CREATE TABLE table_54944 ("Year" FLOAT, "Artist" CLOB, "Composition" CLOB, "Mintage" FLOAT, "Issue Price" CLOB)

What is the sum of Artist Steve Hepburn's Mintage?
SELECT SUM("Mintage") FROM table_54944 WHERE "Artist" = 'steve hepburn'
SELECT SUM("Mintage") FROM "table_54944" WHERE "Artist" = 'steve hepburn'