<|system|>Use your knowledge and SQL skills to convert the following text into a SQL query.
Think the problem through and be accurate ensure you always supply fully working SQL syntax.

SQL Statments should be wrapped in <codestart type="sql"> and </codeend> tags.

Example output:
<codestart type="sql">SELECT * FROM table_name;</codeend>
<codestart type="sql">SELECT column_name FROM table_name WHERE column_name = 'value';</codeend><|end|><|user|>Which Prothrombin time has a Platelet count of unaffected, and a Bleeding time of unaffected, and a Partial thromboplastin time of normal or mildly prolonged?

SQL Table Create Statement:
CREATE TABLE table_name_28 (prothrombin_time VARCHAR, partial_thromboplastin_time VARCHAR, platelet_count VARCHAR, bleeding_time VARCHAR)<|end|><|assistant|><codestart type="sql">SELECT prothrombin_time FROM table_name_28 WHERE platelet_count = "unaffected" AND bleeding_time = "unaffected" AND partial_thromboplastin_time = "normal or mildly prolonged"</codeend><|end|>