Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_96 (viewers__m_ VARCHAR, share VARCHAR)

### Question ###
What is the average rating of viewers 18 to 49 where the total viewer count is 3.93 million and share less than 4?

### Accurate SQL ###

SELECT AVG(18 AS _49) FROM table_name_96 WHERE viewers__m_ = 3.93 AND share < 4