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_6 ( shirt_no INTEGER, birth_date VARCHAR, weight VARCHAR )

### Question ###
Birth Date of 8 November 1980, and a Weight smaller than 93 has what sum of a shirt number?

### Accurate SQL ###

SELECT SUM(shirt_no) FROM table_name_6 WHERE birth_date = "8 november 1980" AND weight < 93