CREATE TABLE table_1555308_1 (bleeding_time VARCHAR(255), platelet_count VARCHAR(255), prothrombin_time VARCHAR(255))
How is the bleeding time wherein platelet count is decreased and prothrombin time is unaffected?
    
SQL: SELECT bleeding_time FROM table_1555308_1 WHERE platelet_count = "Decreased" AND prothrombin_time = "Unaffected"