postgresql-simple query error
问题 EDIT: I now have a better idea of what is going wrong. When I perform that query in plain old psql , I get the following result: lwm@verbos =# SELECT * FROM gerund LIMIT1; infinitive │ gerund │ gerund_english ────────────┼─────────────┼──────────────── abandonar │ abandonando │ abandoning So, I am getting back 3 strings? However, I say that I am getting back IO [Only String] . I am sure it is my type signature here that is messing things up ... I am trying to make a simple query using the