CREATE TABLE table_name_73 (original_airdate VARCHAR2, nightly_rank VARCHAR2, viewers__millions_ VARCHAR2)

Original airdate for #6 with 1.246 viewers?
SELECT original_airdate FROM table_name_73 WHERE nightly_rank = "#6" AND viewers__millions_ = 1.246
SELECT "original_airdate" FROM "table_name_73" WHERE "#6" = "nightly_rank" AND "viewers__millions_" = 1.246