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  2. Set operations (SQL) - Wikipedia

    en.wikipedia.org/wiki/Set_operations_(SQL)

    A UNION query could combine results from both tables. Note that UNION ALL does not guarantee the order of rows. Rows from the second operand may appear before, after, or mixed with rows from the first operand. In situations where a specific order is desired, ORDER BY must be used. Note that UNION ALL may be much faster than plain UNION.

  3. Disjoint-set data structure - Wikipedia

    en.wikipedia.org/wiki/Disjoint-set_data_structure

    After some operations of Union, some sets are grouped together. The operation Union(x, y) replaces the set containing x and the set containing y with their union. Union first uses Find to determine the roots of the trees containing x and y. If the roots are the same, there is nothing more to do. Otherwise, the two trees must be merged.

  4. Relational algebra - Wikipedia

    en.wikipedia.org/wiki/Relational_algebra

    The relational algebra uses set union, set difference, and Cartesian product from set theory, and adds additional constraints to these operators to create new ones.. For set union and set difference, the two relations involved must be union-compatible—that is, the two relations must have the same set of attributes.

  5. 15 Easy Appetizers You Can Make Ahead of Christmas Day - AOL

    www.aol.com/15-easy-appetizers-ahead-christmas...

    Shrimp Dip. Whip up this nostalgic dip the day before and refrigerate it overnight. All you'll need to do is add a layer of cocktail sauce and a side of crackers for dipping.

  6. List of set identities and relations - Wikipedia

    en.wikipedia.org/wiki/List_of_set_identities_and...

    Throughout this article, capital letters (such as ,,,,, and ) will denote sets.On the left hand side of an identity, typically, will be the L eft most set,; will be the M iddle set, and

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    See all deals. In Other News. Entertainment. Entertainment. People. Tom Green is engaged: 'I am the luckiest guy in the world' Entertainment. People

  8. Phone companies haven't notified most victims of Chinese data ...

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    “Mapping the social relationships between groups of politicos would be pretty useful.” The U.S. and Western cybersecurity companies have for years accused China’s cyberspies of ...

  9. Union (SQL) - Wikipedia

    en.wikipedia.org/?title=Union_(SQL)&redirect=no

    Set operations (SQL)#UNION operator To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .