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  2. Query plan - Wikipedia

    en.wikipedia.org/wiki/Query_plan

    A query plan (or query execution plan) is a sequence of steps used to access data in a SQL relational database management system.This is a specific case of the relational model concept of access plans.

  3. Database index - Wikipedia

    en.wikipedia.org/wiki/Database_index

    The non-clustered index tree contains the index keys in sorted order, with the leaf level of the index containing the pointer to the record (page and the row number in the data page in page-organized engines; row offset in file-organized engines). In a non-clustered index, The physical order of the rows is not the same as the index order.

  4. DBSCAN - Wikipedia

    en.wikipedia.org/wiki/DBSCAN

    Distance function: The choice of distance function is tightly coupled to the choice of ε, and has a major impact on the results. In general, it will be necessary to first identify a reasonable measure of similarity for the data set, before the parameter ε can be chosen.

  5. Determining the number of clusters in a data set - Wikipedia

    en.wikipedia.org/wiki/Determining_the_number_of...

    The average silhouette of the data is another useful criterion for assessing the natural number of clusters. The silhouette of a data instance is a measure of how closely it is matched to data within its cluster and how loosely it is matched to data of the neighboring cluster, i.e., the cluster whose average distance from the datum is lowest. [8]

  6. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS.It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA).

  7. Unique key - Wikipedia

    en.wikipedia.org/wiki/Unique_key

    On some RDBMS a primary key generates a clustered index by default. Unique constraint. A unique constraint can be defined on columns that allow nulls, in which case rows that include nulls may not actually be unique across the set of columns defined by the constraint. Each table can have multiple unique constraints.

  8. Yelp's Best New Restaurants for 2024: Would you dine at one ...

    www.aol.com/yelps-best-restaurants-2024-dine...

    Mēdüzā Mediterrania in New York City, New York ranks No. 1 on Yelp's Best New Restaurants of 2024. Celebrities like Taylor Swift and Cardi B have dined at the restaurant.

  9. Extensible Storage Engine - Wikipedia

    en.wikipedia.org/wiki/Extensible_Storage_Engine

    Indexes are defined to persist interesting orders of data, and allow both sequential access to records in index order, and direct access to records by index column values. Clustered indexes in ESE must also be primary, meaning that the index key must be unique. Clustered and non-clustered indexes are represented using B+ trees. If an insert or ...