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Which of the followings are not characteristics of a database when compared with an IR (information retrieval) system? Search request returns list of documents Relational

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Which of the followings are not characteristics of a database when compared with an IR (information retrieval) system? Search request returns list of documents Relational (or object) data model is predominant Results are based on approximate matching (i.e. ranked) Free-form query models Schema driven Structured data

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