CREATE TABLE table_447 ("Character ( s ) " CLOB, "First Appearance" CLOB, "Cover Date" CLOB, "Publisher" CLOB, "Estimated Value" CLOB)

what is the total number of publisher where cover date is may 1939
SELECT COUNT("Publisher") FROM table_447 WHERE "Cover Date" = 'May 1939'
SELECT COUNT("Publisher") FROM "table_447" WHERE "Cover Date" = 'May 1939'