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  2. Database index - Wikipedia

    en.wikipedia.org/wiki/Database_index

    In the phone book example with a composite index created on the columns (city, last_name, first_name), if we search by giving exact values for all the three fields, search time is minimal—but if we provide the values for city and first_name only, the search uses only the city field to retrieve all matched

  3. RFM (market research) - Wikipedia

    en.wikipedia.org/wiki/RFM_(market_research)

    Monetary = the highest value of all purchases by the customer expressed in relation to some benchmark value For example, if the monetary benchmark allocated a score of 10 to annual spend over $500, for a customer who had made three purchases in the last year, the most recent being 3 months ago, and spent $600 in the year, their scores would be ...

  4. Lookup table - Wikipedia

    en.wikipedia.org/wiki/Lookup_table

    A common solution is to initially compute the sine of many evenly distributed values, and then to find the sine of x we choose the sine of the value closest to x through array indexing operation. This will be close to the correct value because sine is a continuous function with a bounded rate of change. [10]: 6 For example: [11]: 545–548

  5. Microsoft Office 2007 - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Office_2007

    Column titles can optionally show options to control the layout of the column. Multithreaded calculation of formulae, to speed up large calculations, especially on multi-core/multi-processor systems. User Defined Functions (UDF), which are custom functions written to supplement Excel's set of built-in functions, supports the increased number of ...

  6. 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]

  7. Join (SQL) - Wikipedia

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

    An inner join (or join) requires each row in the two joined tables to have matching column values, and is a commonly used join operation in applications but should not be assumed to be the best choice in all situations. Inner join creates a new result table by combining column values of two tables (A and B) based upon the join-predicate.

  8. Select (SQL) - Wikipedia

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

    The query retrieves all rows from the Book table in which the price column contains a value greater than 100.00. The result is sorted in ascending order by title. The asterisk (*) in the select list indicates that all columns of the Book table should be included in the result set.

  9. Multiple-criteria decision analysis - Wikipedia

    en.wikipedia.org/wiki/Multiple-criteria_decision...

    In this example a company should prefer product B's risk and payoffs under realistic risk preference coefficients. Multiple-criteria decision-making (MCDM) or multiple-criteria decision analysis (MCDA) is a sub-discipline of operations research that explicitly evaluates multiple conflicting criteria in decision making (both in daily life and in settings such as business, government and medicine).

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