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Structured Query Language (SQL) is a classical way to access relational databases. Although SQL is powerful to query relational databases, it is rather hard for inexperienced users to pose SQL queries, as they are required to be familiar with SQL syntax and have a thorough understanding of the underlying schema. To provide an alternative search paradigm, keyword search and form-based search are proposed, which only need users to type in keywords in single or multiple input boxes and return answers after users submit a query with complete keywords.
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