CREATE TABLE table_204_840 (id DECIMAL, "no. in\ series" DECIMAL, "no. in\ season" DECIMAL, "title" TEXT, "directed by" TEXT, "written by" TEXT, "original air date" TEXT, "prod. code" TEXT)

how many episodes aired in may 1997 ?
SELECT COUNT(*) FROM table_204_840 WHERE "original air date" = 5 AND "original air date" = 1997
SELECT COUNT(*) FROM "table_204_840" WHERE "original air date" = 1997 AND "original air date" = 5