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  2. 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.

  3. Nested set model - Wikipedia

    en.wikipedia.org/wiki/Nested_set_model

    The Nested Set model is appropriate where the tree element and one or two attributes are the only data, but is a poor choice when more complex relational data exists for the elements in the tree. Given an arbitrary starting depth for a category of 'Vehicles' and a child of 'Cars' with a child of 'Mercedes', a foreign key table relationship must ...

  4. Join (SQL) - Wikipedia

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

    Join method: Given two tables and a join condition, multiple algorithms can produce the result set of the join. Which algorithm runs most efficiently depends on the sizes of the input tables, the number of rows from each table that match the join condition, and the operations required by the rest of the query.

  5. 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.

  6. 2 men accused of operating drones 'dangerously close' to ...

    www.aol.com/2-men-arrested-hazardous-drone...

    The arrests occur amid a number of reported drone sightings in the Northeast, including New Jersey, New York and Pennsylvania.

  7. Woman Rescues Hundreds Of Disabled Pups, Builds Them A Dog ...

    www.aol.com/woman-rescues-hundreds-disabled-pups...

    For example, this one woman in Turkey has rescued hundreds of disabled stray dogs who were finally given a second chance at life, all thanks to her. It was over 4 years ago when a woman from ...

  8. Select (SQL) - Wikipedia

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

    The derived table also is referred to as an inline view or a select in from list. In the following example, the SQL statement involves a join from the initial Books table to the derived table "Sales". This derived table captures associated book sales information using the ISBN to join to the Books table.

  9. Realtor group picks top 10 housing hot spots for 2025: Did ...

    www.aol.com/realtor-group-picks-top-10-171047166...

    The NAR released The Top 10 Housing Hot Spots for 2025 on Thursday and map markers skew mostly toward Appalachia, with cities in the Carolinas, Tennessee and Indiana topping the list.