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

what is next after zuse z4
SELECT "name" FROM table_204_577 WHERE "first operational" > (SELECT "first operational" FROM table_204_577 WHERE "name" = 'zuse z4') ORDER BY "first operational" LIMIT 1
SELECT "name" FROM "table_204_577" WHERE "first operational" > (SELECT "first operational" FROM "table_204_577" WHERE "name" = 'zuse z4') ORDER BY "first operational" NULLS FIRST LIMIT 1