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_28 ( rank INTEGER, bronze VARCHAR, silver VARCHAR, gold VARCHAR )

### Question ###
What is the sum of rank when silver is 1, and gold is less than 7, and bronze is 2?

### Accurate SQL ###

SELECT SUM(rank) FROM table_name_28 WHERE silver = 1 AND gold < 7 AND bronze = 2