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2. Numbers (spreadsheet) - Wikipedia

   en.wikipedia.org/wiki/Numbers_(spreadsheet)

   Instead, Numbers places pop-up menus in the column headers allowing the user to collapse multiple rows into totals (sums, averages, etc.) based on data that is common across rows. This is similar functionality to a pivot table but lacks the ease of re-arrangement of the Improv model and other advanced features.

3. Aggregate function - Wikipedia

   en.wikipedia.org/wiki/Aggregate_function

   The listagg function, as defined in the SQL:2016 standard [2] aggregates data from multiple rows into a single concatenated string. In the entity relationship diagram, aggregation is represented as seen in Figure 1 with a rectangle around the relationship and its entities to indicate that it is being treated as an aggregate entity. [3]

4. Spreadsheet - Wikipedia

   en.wikipedia.org/wiki/Spreadsheet

   Formulas in the B column multiply values from the A column using relative references, and the formula in B4 uses the SUM() function to find the sum of values in the B1:B3 range. A formula identifies the calculation needed to place the result in the cell it is contained within. A cell containing a formula, therefore, has two display components ...

5. Pivot table - Wikipedia

   en.wikipedia.org/wiki/Pivot_table

   Column labels are used to apply a filter to one or more columns that have to be shown in the pivot table. For instance if the "Salesperson" field is dragged to this area, then the table constructed will have values from the column "Sales Person", i.e., one will have a number of columns equal to the number of "Salesperson". There will also be ...

6. Database index - Wikipedia

   en.wikipedia.org/wiki/Database_index

   Suppose a database contains N data items and one must be retrieved based on the value of one of the fields. A simple implementation retrieves and examines each item according to the test. If there is only one matching item, this can stop when it finds that single item, but if there are multiple matches, it must test everything.

7. Numeric precision in Microsoft Excel - Wikipedia

   en.wikipedia.org/wiki/Numeric_precision_in...

   Although this number has a decimal representation that is an infinite string of ones, Excel displays only the leading 15 figures. In the second line, the number one is added to the fraction, and again Excel displays only 15 figures. In the third line, one is subtracted from the sum using Excel.

8. Checksum - Wikipedia

   en.wikipedia.org/wiki/Checksum

   The procedure which generates this checksum is called a checksum function or checksum algorithm. Depending on its design goals, a good checksum algorithm usually outputs a significantly different value, even for small changes made to the input. [ 2 ]

9. Arbitrary-precision arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arbitrary-precision_arithmetic

   Rather than representing a number as single value, some store numbers as a numerator/denominator pair and some can fully represent computable numbers, though only up to some storage limit. Fundamentally, Turing machines cannot represent all real numbers , as the cardinality of R {\displaystyle \mathbb {R} } exceeds the cardinality of Z ...