CREATE TABLE table_204_577 (id DECIMAL, "name" TEXT, "first operational" TEXT, "numeral system" TEXT, "computing mechanism" TEXT, "programming" TEXT, "turing complete" TEXT)

what was the first computer to use a decimal numeral system ?
SELECT "name" FROM table_204_577 WHERE "numeral system" = 'decimal' ORDER BY "first operational" LIMIT 1
SELECT "name" FROM "table_204_577" WHERE "numeral system" = 'decimal' ORDER BY "first operational" NULLS FIRST LIMIT 1