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_9 (decimal VARCHAR, byte_string VARCHAR, model VARCHAR)

### Question ###
When a Sigma 7 has a standard byte string, what is the value for the decimal?

### Accurate SQL ###

SELECT decimal FROM table_name_9 WHERE byte_string = "standard" AND model = "sigma 7"