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_1226250_1 ( partial_thromboplastin_time VARCHAR, bleeding_time VARCHAR, prothrombin_time VARCHAR )

### Question ###
How long does thromboplastin last when prothrombin is unaffected?

### Accurate SQL ###

SELECT partial_thromboplastin_time FROM table_1226250_1 WHERE bleeding_time = "Unaffected" AND prothrombin_time = "Unaffected"