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_20136 ( "Condition" text, "Prothrombin time" text, "Partial thromboplastin time" text, "Bleeding time" text, "Platelet count" text )

### Question ###
How is the bleeding time wherein platelet count is decreased and prothrombin time is unaffected?

### Accurate SQL ###

SELECT "Bleeding time" FROM table_20136 WHERE "Platelet count" = 'Decreased' AND "Prothrombin time" = 'Unaffected'