While it is tempting to give users infinite freedom to enter information into a web site, it is usually best to limit their inputs as much as possible. Creating simple HTML-based query generators is not difficult and can even be easy once you get the hang of it. The trick is to formulate queries in such a way that the user can get the maximum information while knowing as little as possible about the underlying database. Even when the queries are easy to create, finding ways to turn those queries into language suitable for non-programmers can be a challenge.
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