CREATE TABLE table_30788 ("Player" CLOB, "Matches" FLOAT, "Innings" FLOAT, "Runs" FLOAT, "Average" CLOB, "Highest Score" CLOB, "100s" FLOAT, "50s" FLOAT)

How many entries is under 50s column when the average is 39.60?
SELECT "50s" FROM table_30788 WHERE "Average" = '39.60'
SELECT "50s" FROM "table_30788" WHERE "Average" = '39.60'