CREATE TABLE table_51322 ("Episode" TEXT, "Air Date" TEXT, "Timeslot  ( EST ) " TEXT, "Season" FLOAT, "Rating" FLOAT, "Share" FLOAT, "18\\u201349" FLOAT, "Viewers  ( m ) " FLOAT, "Rank  ( # ) " TEXT)

What is the average rating of viewers 18 to 49 where the total viewer count is 3.93 million and share less than 4?
SELECT AVG("18\u201349") FROM table_51322 WHERE "Viewers (m)" = '3.93' AND "Share" < '4'
SELECT AVG("18\u201349") FROM "table_51322" WHERE "Share" < '4' AND "Viewers (m)" = '3.93'