Browsing by Author "Glushko, Iryna"

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    The advanced operations of table algebra
    (Видавництво Львівської політехніки, 2013) Glushko, Iryna
    Table algebra is filled up with new operations such as inner and outer join, semijoin, outer set operations. A formal mathematical semantics of these operations is defined. The special element NULL is inserted in the universal domain for to define of outer join and outer set operations.