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  2. Hierarchical and recursive queries in SQL - Wikipedia

    en.wikipedia.org/wiki/Hierarchical_and_recursive...

    A common table expression, or CTE, (in SQL) is a temporary named result set, derived from a simple query and defined within the execution scope of a SELECT, INSERT, UPDATE, or DELETE statement. CTEs can be thought of as alternatives to derived tables ( subquery ), views , and inline user-defined functions.

  3. SQL syntax - Wikipedia

    en.wikipedia.org/wiki/SQL_syntax

    SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.

  4. Set operations (SQL) - Wikipedia

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

    Set operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. [1] Set operators in SQL include UNION, INTERSECT, and EXCEPT, which mathematically correspond to the concepts of union, intersection and set difference.

  5. Merge (SQL) - Wikipedia

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

    Additionally there is a single-row version, UPDATE OR INSERT INTO tablename (columns) VALUES (values) [MATCHING (columns)], but the latter does not give you the option to take different actions on insert versus update (e.g. setting a new sequence value only for new rows, not for existing ones.)

  6. Greenlanders are worried to find themselves on Trump's ...

    www.aol.com/greenlanders-worried-themselves...

    Other leaders were similarly circumspect about Trump’s apparent threat to invade a fellow member of NATO. Danish Prime Minister Mette Frederiksen on Tuesday referred to the U.S. as Denmark's ...

  7. Potential government shutdown impacts: Millions of federal ...

    www.aol.com/potential-government-shutdown...

    If Congress fails to pass the continuing resolution to fund the government by the end of the day Friday, millions of federal workers could head into the holidays without paychecks.

  8. James Denton Admits He Actually Loved the “Desperate ... - AOL

    www.aol.com/james-denton-admits-actually-loved...

    Many Desperate Housewives fans are still mourning the death of Mike Delfino, 12 years later. But for actor James Denton, getting shot "was a lot of fun.". In a recent interview with PEOPLE, the ...

  9. Correlated subquery - Wikipedia

    en.wikipedia.org/wiki/Correlated_subquery

    In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values from the outer query. This can have major impact on performance because the correlated subquery might get recomputed every time for each row of the outer query is processed.