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_1 (partial_thromboplastin_time VARCHAR, condition VARCHAR, prothrombin_time VARCHAR, bleeding_time VARCHAR)

### Question ###
Which Partial thromboplastin time has a Prothrombin time of prolonged, and a Bleeding time of unaffected, and a Condition of vitamin k deficiency or warfarin? Question 6

### Accurate SQL ###

SELECT partial_thromboplastin_time FROM table_name_1 WHERE prothrombin_time = "prolonged" AND bleeding_time = "unaffected" AND condition = "vitamin k deficiency or warfarin"