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  2. Set operations (SQL) - Wikipedia

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

    In SQL the UNION clause combines the results of two SQL queries into a single table of all matching rows. The two queries must result in the same number of columns and compatible data types in order to unite.

  3. Multiset - Wikipedia

    en.wikipedia.org/wiki/Multiset

    A multiset may be formally defined as an ordered pair (A, m) where A is the underlying set of the multiset, formed from its distinct elements, and : + is a function from A to the set of positive integers, giving the multiplicity – that is, the number of occurrences – of the element a in the multiset as the number m(a).

  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. Comparison of object–relational database management systems

    en.wikipedia.org/wiki/Comparison_of_object...

    GIS for public utilities; can be stored inside Oracle Database WakandaDB 4th Dimension: AGPLv3 or proprietary Windows, Linux, macOS Based on REST and server-side JavaScript XDB Enterprise Server: Micro Focus: Proprietary DOS, Windows NT, OS/2 YugabyteDB: Yugabyte: Apache 2.0 Linux Zope Object Database: Zope Corporation Zope Public License ...

  6. 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.

  7. Trump’s three-day immigration blitz severely tightens border ...

    www.aol.com/trump-three-day-immigration-blitz...

    The Trump administration has moved with lightning speed to roll out the president’s immigration agenda, effectively closing off the US southern border to asylum seekers, severely limiting who ...

  8. US Democratic lawmakers question Trump's blockage of clean ...

    www.aol.com/news/senate-democrats-epa-blockage...

    By Valerie Volcovici. WASHINGTON (Reuters) - U.S. Democratic lawmakers Friday sent letters to two federal agencies asking them to explain why they froze federal funds on clean energy and ...

  9. List of SQL reserved words - Wikipedia

    en.wikipedia.org/wiki/List_of_SQL_reserved_words

    Reserved words in SQL and related products In SQL:2023 [3] In IBM Db2 13 [4] In Mimer SQL 11.0 [5] In MySQL 8.0 [6] In Oracle Database 23c [7] In PostgreSQL 16 [1] In Microsoft SQL Server 2022 [2]