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  2. Nested set model - Wikipedia

    en.wikipedia.org/wiki/Nested_set_model

    The nested set model is a technique for representing nested set collections (also known as trees or hierarchies) in relational databases.. It is based on Nested Intervals, that "are immune to hierarchy reorganization problem, and allow answering ancestor path hierarchical queries algorithmically — without accessing the stored hierarchy relation".

  3. Array DBMS - Wikipedia

    en.wikipedia.org/wiki/Array_DBMS

    An array database management system or array DBMS provides database services specifically for arrays (also called raster data), that is: homogeneous collections of data items (often called pixels, voxels, etc.), sitting on a regular grid of one, two, or more dimensions. Often arrays are used to represent sensor, simulation, image, or statistics ...

  4. Relational algebra - Wikipedia

    en.wikipedia.org/wiki/Relational_algebra

    Lecture Notes: Relational Algebra – A quick tutorial to adapt SQL queries into relational algebra; Relational – A graphic implementation of the relational algebra; Query Optimization This paper is an introduction into the use of the relational algebra in optimizing queries, and includes numerous citations for more in-depth study.

  5. 6 Side Gigs To Avoid in 2025 - AOL

    www.aol.com/finance/6-side-gigs-avoid-2025...

    The side-gig industry is still booming, but not all side gigs are created equal and not all people doing them make enough money to justify the time and effort involved. According to Self, just ...

  6. MapReduce - Wikipedia

    en.wikipedia.org/wiki/MapReduce

    MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel and distributed algorithm on a cluster. [1] [2] [3]A MapReduce program is composed of a map procedure, which performs filtering and sorting (such as sorting students by first name into queues, one queue for each name), and a reduce method, which performs a summary ...

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

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

    The end of the year means preparing for the one ahead and the National Association of Realtors is already predicting the hottest housing markets for 2025.. The NAR released The Top 10 Housing Hot ...

  8. It is possible to enjoy the holidays while maintaining a healthy lifestyle, says Dr. Nicole Saphier. The Fox News medical contributor shares her tips for navigating the season in a nutritious way.

  9. Table (database) - Wikipedia

    en.wikipedia.org/wiki/Table_(database)

    In a database, a table is a collection of related data organized in table format; consisting of columns and rows.. In relational databases, and flat file databases, a table is a set of data elements (values) using a model of vertical columns (identifiable by name) and horizontal rows, the cell being the unit where a row and column intersect. [1]