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We present QueryViz, a novel visualization tool for SQL queries that reduces the time needed to read and understand existing queries. It targets two principal audiences: (i) users who often issue the same or similar queries and who need to quickly browse through a repository of existing queries; and (ii) novices that try to familiarize themselves with the logic behind alternative patterns of SQL queries. QueryViz uses as input only two strings: the database schema and the SQL query. It can thus serve as light-weight add-on to existing database systems and is also available via an online interface at http://queryviz.com.
Danaparamita et al. (Mon,) studied this question.