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    DING Baokang. A Visual Query Language （VQL） for DatabasesJ. Journal of Computer Research and Development, 1995, 32(1).
    Citation: DING Baokang. A Visual Query Language （VQL） for DatabasesJ. Journal of Computer Research and Development, 1995, 32(1).
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    A Visual Query Language （VQL） for Databases

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    • This paper introduces the development of database languages from QBE to VQL. The VOL can represent OODB’s query. Thus, VQL is a visual database query language for negation.grouping or restrict6d universal quantifier
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