CREATE TABLE table_203_153 (id NUMBER, "stamp issue date" CLOB, "stamp set" CLOB, "#cards" CLOB, "card set ref" CLOB, "qty. issued" NUMBER)

how many stamp sets had at least 50,000 issued ?
SELECT COUNT("stamp set") FROM table_203_153 WHERE "qty. issued" >= 50000
SELECT COUNT("stamp set") FROM "table_203_153" WHERE "qty. issued" >= 50000